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Anatomy 2 > Shoulder Girdle > Flashcards

Shoulder Girdle Flashcards

1
Q

Why is the shoulder referred to as shoulder girdle?

A

It is a complete set of joints

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2
Q

What is the commonly known joint most referred to as the shoulder?

A

Glenoidhumoral joint

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3
Q

What is the Elbow joint actually, not a joint but a what?

A

elbow complex

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4
Q

What are the four bones that make up the shoulder girdle?

A

Scapula, Clavicle, Humerus, Rib cage

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5
Q

What determines the type of joint?

A

the attached connective tissue on the joint

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6
Q

How many true joints are there for the shoulder girdle?

A

three

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7
Q

What are the three True joints of the shoulder girdle?

A

1- Sternoclavicular Joint
2- Acromioclavicular Joint
3- Glenohumeral Joint

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8
Q

Synarthrosis is also known as what joint?

A

Fibrous Joints
remember SAD
SYN (fibrous) AMPH (cartilaginous) DIARTH (synovial)

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9
Q

How many functional joints are there related to the shoulder girdle?

A

three

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10
Q

What is the function of Scapulo-thoracic Joint of the shoulder girdle?

A

Important for shoulder stability and shoulder structure

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11
Q

Name the three functional joints of the shoulder girdle

A

1- Scapulo-thoracic Joint
2- Supra-humeral/ Sub-acromial Space
3- Long head of biceps within the bicipital groove

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12
Q

What is the structures that hold the Scapular to the Thorax in the Scapulo-thoracic joint?

A

Subscapularis, Serratus Anterior, Rhomboid Major, Rhomboid Minor

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13
Q

Supra-humeral/Sub-acromial Space is located where?

A

In between the Acromion process and the head of the humerus

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14
Q

Why is it important to maintain the suprahumeral/subacromial space?

A

It houses the tendons of Infraspinatis, Supraspinatis, Long head of the Biceps brachii, and Subacromial Bursa

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15
Q

What is the condition when the Subacromial/ Suprahumeral space is compromised?

A

Glenohumeral Impingment

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16
Q

What might be the implication of the humeral head riding up and impinging the subacromial/suprahumeral space?

A

Rotator cuff tear and make contact with the rotator cuff

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17
Q

What happens if the humeral head makes constant contact with the acromion?

A

Bone spur due to Wolff’s Law or Osteoblastic activity

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18
Q

What is located in the Bicpital groove?

A

Long head of the biceps brachii

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19
Q

What is the Medial border of the scapular also known as?

A

Vertebral border

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20
Q

What is the Lateral border of the scapular also known as?

A

Axillary border

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21
Q

Inferior angle of the scapular is at what level?

A

T7 spinous process

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22
Q

Superior angle of the scapular is at what level?

A

T2 spinous process

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23
Q

The subscapular fossa houses what?

A

Is the origin of the subscapularis muscle

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24
Q

Clavicle medially is what convex or concave?

A

Convex anteriorly

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25
Q

Clavicle laterally is what convex or concave?

A

Concave anteriorly

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26
Q

How is the Coracoid process of the scapular oriented?

A

Anterior and Laterally

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27
Q

What nerve travels through the suprascapular notch of the scapular?

A

suprascapular nerve

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28
Q

What does the Suprascapular nerve innervate?

A

Supraspinatis and Infraspinatis muscles

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29
Q

What does the Suprasapular nerve dive under right before innervating the two posterior scapular muscles?

A

Acromion process

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30
Q

The Oval glenoid fossa and Humeral head is what ratio in size?

A

1:3 ratio Humeral head being much larger

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31
Q

What sort of joint is the Glenoid-humeral Joint?

A

Synovial joint with hyaline cartilage on the articulating surfaces

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32
Q

What is the bump on the apex of the Glenoidhumeral joint?

A

Supraglenoid tubercle

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33
Q

What attaches to the supraglenoid tubercle?

A

Origin point Long head of the biceps brachii

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34
Q

Where is the infraglenoid tubercle located?

A

outside the glenoid fossa just inferior to the fossa

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35
Q

What attaches to the infraglenoid tubercle?

A

origin point for Long head of the triceps brachii

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36
Q

What is the medial and lateral portion of the clavicle called?

A

Sternal end and acromional end

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37
Q

On the lateral size of the clavicle what are the two bumps called?

A

Trapezoid tubercle and Conoid tubercle

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38
Q

What attaches to the Trapezoid and Conoid tubercle?

A

Trapezoid and Conoid Ligament

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39
Q

Collectively what is the Trapezoid and Conoid Ligament called?

A

Coracoclevicular ligament

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40
Q

What ends at the anatomical neck of the humerus?

A

articular cartilage of the hyaline cartilage on the humeral head

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41
Q

Where does the surgical neck of the humerus get it’s name?

A

Location of surgery due to a fracture there mostly a ORIF

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42
Q

What nerve and artery is attached to or around the surgical humeral neck?

A

Axillary nerve and posterior post humeral artery

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43
Q

Where is the Intertubercular groove aka Bicipital groove located?

A

Anterior surface in between the Greater tubercle and lesser tubercle

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44
Q

Where is the greater tubercle located?

A

Lateral and distal aspect of the humerus

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45
Q

Where is the lesser tubercle located?

A

Medial and distal aspect of the humerus

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46
Q

How many of the Rotator cuff muscles attach to the greater tubercle? and what?

A

three. Teres minor, Supraspinalus, Infraspinalus

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47
Q

What is the ridge of bones just inferior to the Greater Tubercle called?

A

Lateral lip of the bicipital groove or Crest of the Greater tubercle

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48
Q

How many of the Rotator cuff muscles attach to the lesser tubercle? and what?

A

one. Subscapularis

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49
Q

What inserts into the Lateral lip of the bicipital groove or Crest of the Greater tubercle?

A

Insertion point of pectoralis major. It isn’t on the Greater Tubercle!!! it’s in the larger space of the CREST of the greater tubercle. Distal, inferior, lateral to the tubercle

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50
Q

What inserts to the Medial lip of the bicipital groove or Crest of the Lesser tubercle?

A

Insertion point for Teres Major and Latissimus Dorsi. Also not on the Tubercle! on the crest

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51
Q

lateral aspect of 1/3 of the way down on the humerus, the roughened area is called the what?

A

Deltoid tuberosity, where the deltoid attaches

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52
Q

What is superficial to the Deltoid Tuberosity?

A

Subdeltoid Bursa where the deltoid actually attaches

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53
Q

Posterior aspect of the humerus running Medial to Lateral what is that groove called?

A

Musculospiral groove or Radial Groove

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54
Q

What runs in the musculospiral groove or radial groove?

A

Radial Nerve and deep brachial artery

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55
Q

What attaches just above the musculospiral/radial groove?

A

Lateral head of the triceps brachii attaches on the shaft of the humerus

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56
Q

What attaches just below the musculospiral/radial groove?

A

Medial head of the triceps brachii attaches on the shaft of the humerus

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57
Q

What is the widest portion of the distal humerus called?

A

Epicondyles, Medial and Lateral epicondyle

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58
Q

What resembles a spool of thread on the medial humerus?

A

Trochlea

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59
Q

What are the condyles function on the humerus?

A

articulating surfaces for ulna and radius

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60
Q

What is the bulbus spherical condyle on the lateral humerus is what?

A

Capitulum

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61
Q

On the humerus where is the olecronon fossa located?

A

in between the Capitulum and Trochlea on the posterior aspect

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62
Q

What goes into the Olecronon Fossa when you elbow extend?

A

Olecranon process of the Ulna

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63
Q

What is just superior to the Capitulum, an indentation

A

Radial Fossa

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64
Q

When you flex your elbow what fits into the Radial fossa?

A

The radial head

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65
Q

When you flex your elbow what fits into the Coranoid fossa?

A

The coranoid process of the ulna

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66
Q

What is the most superior and posterior aspect of the ulna called?

A

Olecranon process

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67
Q

What is the concavity of the anterior aspect of the ulna called?

A

Trochlear notch, where the humerus’ Trochlea fits into

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68
Q

What is just lateral and inferior to the trochlear notch?

A

Radial notch, where the head of the radius fits into

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69
Q

What is just distal of the Ulnar head?

A

Ulnar styloid process

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70
Q

What is the larger bulbous bump of your wrist medially?

A

Ulnar head

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71
Q

Is the Radial head superior or inferior?

A

Superior/proximal

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72
Q

What is the concavity at the head of the radius called?

A

Fovea

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73
Q

What is the thin inferior to the head of the radius called?

A

neck of the radius

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74
Q

What is the large bulbous portion inferior to the neck of the radius called?

A

Radial tuberosity

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75
Q

What inserts to the radial tuberosity?

A

insertion point for Biceps brachii

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76
Q

Which bone the most lateral bone in the forearm?

A

Radius

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77
Q

When you pronate and supinate which forearm bone moves?

A

The radius bone moves around the ulnar

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78
Q

What bones does all pronation and supination muscles attach to ?

A

Radius

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79
Q

On the Ulnar what is just inferior to the Trochlear notch?

A

Ulnar tuberosity

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80
Q

What muscles attaches to the Ulnar tuberosity?

A

Brachialis

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81
Q

What movement does the Brachialis produce?

A

Neither bc its not attached to the radius

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82
Q

What movement does the biceps brachii produce?

A

Supination of the forearm

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83
Q

What is the most distal portion of the radius, the projection?

A

Radial styloid process

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84
Q

What is the medial indentation of the radius called?

A

Ulnar notch

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85
Q

What fits into the Ulnar notch of the radius?

A

Ulnar head

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86
Q

The most inferior surface of the radius is for what?

A

Carpal articulation

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87
Q

Which two carpal bones will the Distal articulating surface of the radius articulate with?

A

Scaphoid and Lunate

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88
Q

What is the physical difference between posterior and anterior surface of the distal radius?

A

Anterior and concaved and flat where as the posterior portion is pointing out

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89
Q

What is the point of distal posterior of the radius called?

A

Dorsal tubercle or Lister’s Tubercle of the radius

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90
Q

What is relationship between a muscle to the Lister’s Tubercle or Dorsal tubercle?

A

Extensor Pollicus longus will loop around it and change direction

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91
Q

What are the eight carpal bones?

A

some lovers try positions that they cant handle

scaphoid lunate triquestrum pisiform trapezium trapezoid capitate hamate

92
Q

How are the 8 carpal bones ordered?

A

Proximal row and Distal row

93
Q

What is the most proximal and lateral carpal bone and in the anatomical snuff box

A

Scaphoid

94
Q

What are the two carpal bones that articulate with the radius?

A

Scaphoid and Lunate

95
Q

Which proximal row carpal bone isn’t actually in it but sticks out and floats alone?

A

Pisiform

96
Q

What sort of bone is Pisiform carpal?

A

sysmoid bone or aka floating bone

97
Q

Which carpal is just inferior to the ulnar

A

Triquetrum

98
Q

Which carpal is most lateral and distal?

A

Trapezium

99
Q

What does the Trapezium align with and articulate with?

A

Articulates with the 1st digit (Thumb)

100
Q

What does the Trapezoid align with and articulate with?

A

2nd digit (Index)

101
Q

What does the Capitate align with and articulate with?

A

3rd digit

102
Q

What is Capitate AKA?

A

“Key Stone” carpal bone

103
Q

What is on the anterior aspect of the Hamate bone?

A

Hook of Hamate

104
Q

Hook of hamate + Pisiform is what?

A

Guyon’s Canal

105
Q

What does the Hamate align with and articulate with?

A

4th and 5th metacarpal

106
Q

What is just distal to the Carpal bones?

A

Metacarpal bones

107
Q

What are the three parts of the Metacarpals?

A

Head, Shaft, Base

108
Q

What is on the distal portion of the Metacarpals? and what’s its shape?

A

the head which is convex

109
Q

What part of the metacarpal articulates with the carpal and whats its shape?

A

concaved base

110
Q

How many Metacarpal are there?

A

5

111
Q

How many Phalanges are there?

A

14

112
Q

what’s the shape of the phalanges’ head and base?

A

base is concaved and head is convexed

113
Q

What are the three phalange called?

A

distal, middle, proximal phalanges

114
Q

Whats the different between digits 2,3,4,5 vs digit 1

A

digits 2,3,4,5 have three segments: distal, middle, proximal

digit 1 has only 2 segment: distal and proximal

115
Q

At the level of the head of 1st metacarpal what is located there?

A

2 sesmoid bones known as the sesmoid bones of the thumb

116
Q

What is located in between the sesmoid bones of the thumb

A

The long tendon of Flexor pollicus longus

117
Q

What tendon is the sesmoid bones of the thumb inbedded in?

A

tendon of Flexor pollicus brevis

118
Q

What is the only attachment of the UE to the axial skeleton?

A

Sternoclavicular Joint

119
Q

What kind of joint is Sternoclavicular Joint?

A

Synovial Saddle Joint

120
Q

What sort of disc is in the Sternoclavicular Joint?

A

FIbrocartilagenous disc

121
Q

what is the function o fthe fibrocartilagenous disc in the sternoclavicular joint?

A

increases congruency (increase contact points of each surfaces aka fills in the gaps formed when saddle joint moves) and enhance joint movement

122
Q

How many DOF does sternoclavicular joint have? and name them.

A

Three
1- elevation/depression
2- protraction/retraction
3- posterior/anterior

123
Q

What is sternoclavicular joint anterior rotation and posterior rotation?

A

posterior rotation is the movement of the clavicle at only the end ROM of shoulder elevation
anterior rotation is the resting position after posterior rotation

124
Q

Name the shoulder elevation movements.

A

Shoulder abd
Scaption
Shoulder flexion

125
Q

If you can’t posteriorly rotate the clavicle what other motion is now limited?

A

full shoulder elevation

126
Q

Is the sternoclavicular joint easily injured?

A

no. very strong due to many strong ligaments

127
Q

What are the ligaments located anterior and posteriorly on the SC joint?

A

two Anterior and two Posterior SC joint

128
Q

What movements does the Anterior and Posterior SC Joint prevent?

A

excessive anterior and posterior movement of the sternal end of the clavicle

129
Q

What sits on top of the two Anterior/Posterior SC Joint?

A

one Interclavicular ligament

130
Q

What movement does the Interclavicular ligament

A

Excessive superior movement of the sternal end of the clavicle

131
Q

What bone is just Inferior to the clavicle?

A

1st rib

132
Q

What ligament attaches from the 1st rib to the clavicle in the SC joint medially?

A

costoclavicular ligament

133
Q

what movement does the costoclavicular ligament

A

excessive elevation of the sternal end of the clavicle

134
Q

What kind of joint is the acromioclavicular joint?

A

Plane synovial joint - two flat surfaces gliding against each other

135
Q

What union is the AC joint?

A

acromion end of the clavicle and the acromion process of the scapular

136
Q

How many DOF does AC joint have?

A

Three
1- Anterior/Posterior tipping
2- Upward/Downward rotation
3- Internal/External rotation

137
Q

Why does the scapular move or rotate anteriorly when you shrug your shoulder

A

Due to the contour of the thorax, as it follows the contour up it tips anteriorly it will also come back posteriorly when coming back down

138
Q

Whats the size of the fibrocartilage disc in the AC joint?

A

small

139
Q

How many ligaments are there in AC joint?

A

three

140
Q

What are the AC Joint ligaments?

A

Superior AC ligament
Inferior AC ligament
Coracoclavicular ligament

141
Q

Which AC joint ligaments are weak and most likely to be ruptured?

A

Superior and Inferior AC ligament

142
Q

What is the sprain to the AC Joint called?

A

shoulder seperation

143
Q

What is the stronger AC joint called?

A

Coracoclavicular ligament

144
Q

What is the coracoclavicular ligament composed of?

A

lateral trapezoid ligament and medial conoid ligament

145
Q

What is the mechanical/physical property of conoid ligament during rest, shoulder elevation, and end range of shoulder elevation?

A

The conoid ligament is cone in shape due to a wound/spiral nature of the ligament. It is bent in half while the arm/shoulder is at rest to the side. During shoulder elevation the conoid ligament is straight and taut. To allow for the far end range the wound/spiral ligament unwinds a bit to allow for the complete ROM and draws the clavicle into POSTERIOR ROTATION

146
Q

What type of joint is the glenohumeral Joint?

A

Synovial Ball and Socket

147
Q

what are the 3 DOF

A

Flexion/Extension
Abduction/Adduction
Internal/External Rotation

148
Q

What is the GH joint DOF combined called?

A

Circumflexion

149
Q

What is unique of the GH Joint?

A

the Most mobile and least stable in the human body, joint wise. due to the 3:1 ratio

150
Q

In the GH Joint there is an attachment site what is it called?

A

Glenoid Labrum

151
Q

What attaches to the Glenod Labrum?

A

Attachment for Long head of biceps and joint capsule

152
Q

What surrounds all synovial joint like GH joint?

A

Joint capsule

153
Q

What is the relationship between Glenoid Labrum and Joint Capsule?

A

They blend in together.

154
Q

What happens when there is a tear in the joint capsule or Glenoid Labrum of the GH Joint?

A

Since within the Joint capsule there is a negative pressure, a tear in the blended in capsule or glenoid labrum will result in loss of vacuum therefore loss of stability

155
Q

What are the four aspects of the GH joint capsule?

A

superior, inferior, middle, posterior

156
Q

what is unique about the GH joint capsules inferiorly?

A

AKA redundancies which are fold-like which allows for further movement and ability to elevate the arm

157
Q

What it is called when the inferior aspect of the GH joint capsule or redundancy is compromised?

A

Frozen shoulder or adhesive capsulitis

158
Q

What motions are restricted by the Superior, Middle, Inferior GH ligaments?

A

Superior- prevents humeral head dipping/inferiorly
Middle- prevents humeral head going anteriorly
Inferior- prevents inferior and anterior movement

159
Q

What is the Foramen of Weitbrecht? and what’s its function?

A

Foramen found in between the Superior and Middle GH ligament. Allows for the GH dislocation (anteriorly)!!! bad GH dislocation. highly unstable

160
Q

How is GH Joint stabilized?

A

Dynamic stabilization by the muscles around it

161
Q

What is the function joint of the shoulder girdle?

A

Scapulo-thoracic Joint

162
Q

Where is the Scapulo-thoracic Joint and what is its function?

A

Articulation between the Flat scapula and round thoracic cage. allows for appropriate muscle contraction to maintain joint congruency to prevent winging

163
Q

What are the motions occuring at the ST Joint?

A

Elevation/Depression
Protraction/Retraction
Upward/Downward Rotation

164
Q

Where is the motions of ST Joint oriented around?

A

the Glenoid Fossa

165
Q

Why is all the UE stability provided by the ST joint important?

A

it is the proximal stability to allow for good distal stable motions of the UE example of shoveling snow on ice and on solid ground

166
Q

What are the Three muscles related to the ST joint DURING SCAP UPWARD ROTATION and what are their roles?

A

All of these must concommited contract

  • Upper Trap
  • Lower Trap- prevents scap elevation
  • Serratus Anterior- protract scap and maintain medial border to prevent winging
167
Q

What is the loss of contact of the Scapula and Thorax called?

A

Scapular winging

168
Q

What is the movement of the scapula and in what plane during: reach across the body?

A

protract in the direction the hand will be placed on the transverse plane

169
Q

What is the movement of the scapula and in what plane during: shoulder elevation?

A

upward rotation with the glenoid fossa upward in the coronal plane

170
Q

What is the movement of the scapula and in what plane during: reach down?

A

downward rotation with the glenoid fossa pointing down in the coronal plane

171
Q

If you dont have full scapular upward rotation what else is limited?

A

shoulder elevation

172
Q

What region of the spine and motion is important for shoulder elevation by the Rhomboids

A

Functional Thoraxic extension

173
Q

What are the other two ligaments of the shoulder?

A

1- Coracoacromial ligament

2- Transverse humeral ligament

174
Q

Which ligament forms a root for the GH joint? and its junction

A

Coracoacromial ligament

prevents anterior movement therefore prevents impingement

175
Q

What is the Transverse humeral ligament’s function?

A

holds the long head of the biceps in the bicipital groove

176
Q

What are the four muscles of the Rotator cuff?

A

Infraspinatus
Supraspinatus
Subscapularis
Teres minor

177
Q

What happens when the Supraspinatus is injured or torn?

A

Can’t initiate the abduction of the shoulder, the arm will remain on the side of the body.

178
Q

When does the Deltoid start to kick in for shoulder abduction?

A

30-40 degrees

179
Q

Where does the Supraspinatus attach to the greater tubercle of the humerus?

A

Most anterior facet of the greater tubercle after diving under the acromion process

180
Q

Where does the Infraspinatus attach to the greater tubercle of the humerus?

A

Most lateral facet of the greater tubercle after diving under the acromion process

181
Q

Where does the Teres Minor attach to the greater tubercle of the humerus?

A

The most posterior and inferior aspect of the greater tubercle

182
Q

What innervates supraspinatus/infraspinatus?

A

suprascapular nerve

183
Q

what inneravates teres minor?

A

axillary nerve

184
Q

what innervates the subscapularis?

A

upper and lower subscapular nerve

185
Q

How does the subscapularis attach to the humerus and where on it?

A

Attaches to the lesser tubercle without diving the acromion process

186
Q

What motion does Infraspinatus do?

A

ER when the arm is by the side *best ER compared to miny Teres minor

187
Q

What motion does Teres minor do?

A

ER when the arm is abducted to 90 degrees pitchers exercise

188
Q

What motion does Subscapularis do?

A

IR when the arm is at the side

189
Q

what rotator cuff muscle is synergist with deltoid?

A

supraspinatus

190
Q

IF ER is limited which muscle would you say is tight?

A

Subscapularis

191
Q

Rotator cuff provides dynamic stability for what joint?

A

GH joint

192
Q

Since the Deltoid brings up the humeral head superiorly it can cause impingement what muscles pulls the humeral head inferiorly? they centralize the humeral head

A

Infraspinatus, Teres minor, Subscapularis

193
Q

Infraspinatus, Teres minor, and Subscapularis prevents the elevation of humeral head from impingement of what 4 structures?

A

1- Acoracoarcomial arch
2- acromion process
3- supraspiantus tendon
4- subacromial bursa

194
Q

What innervates Trapezius?

A

Spinal accessory nerve

195
Q

When all upper, middle, and lower trapezius contract what motion occurs to the scapula?

A

upward rotation

196
Q

When Rhomboid major and minor contract what motion occurs to the scapula?

A

retraction and downward rotation

197
Q

When levator scapular retracts what motion occurs to the scapula?

A

medially elevates and downward rotation

198
Q

Serratus Anterior retracts what motion occurs to the scapula?

A

Protraction of the scapular

199
Q

Pectoralis Minor attaches to the scapular on the corocoid process retracts what motion occurs to the scapula?

A

protracts, downward rotation, and depress

200
Q

What are the attachments of Pectoralis Minor and scapula?

A

deep to the Pectoralis major attaches corocoid process to rib 3-5 innervated by Medial and Lateral pectoral nerve

201
Q

Highly kyphotic posture could assume they have tight what muscles in the shoulder region?

A

Pectoralis Minor

202
Q

Teres Major attaches from the Inferior angle of the scapula to what?

A

Medial lip of the bicipical groove or crest of the lesser tubercle of the humerus

203
Q

What does the Teres major have the same attachment and actions with?

A

Latissimus dorsi

204
Q

Biceps brachii has two heads, the long head and short head. which is lateral and medial and what are they attachments?

A

Long head is lateral that attaches on supraglenoid tubercle

Short head is medial attaches to the corocoid process

205
Q

What are the two distal attachments of biceps brachii?

A

The tendonis and more lateral attaches to the radial tuberosity
The medial attachments are known as bicipital apeneurosis, blends with the fascia of the forearm

206
Q

How does the biceps get involved with the shoulder?

A

The superior aspect of the biceps it goes over the shoulder muscles

207
Q

Biceps brachii does what three actions

A

shoulder flexion, elbow flexion, and supination

208
Q

What are the attachments of the three heads of triceps brachii?

A

Long head- just inferior to the glenoid fossa aka infraglenoid tuberacle
Lateral head- just superior to the musculospiral groove proximal lateral 1/3 of the humerus
Medial head- medial and distal 2/3 inferior to the musculospiral groove of the humerus

209
Q

How is the Medial head of the humerus found?

A

Just deep to the long head therefore its hard to find

210
Q

What triceps attach to the actual bone of the humerus

A

The Medial head of the triceps brachii bc the long head of the triceps don’t actually attach to the humerus bone it hands out over the medial head.

211
Q

Where do all three heads of the triceps converge?

A

The centralized triceps tendon and blends in to the olecranon process of the ulna.

212
Q

What sits just above the olecranon process of the ulna where the triceps tendon converged?

A

Olecranon bursa

213
Q

Triceps brachii retracts what motion occurs to the scapula?

A

extension of the shoulder

214
Q

How is triceps elbow extension interfered with other UE movements ?

A

Unrelated by other UE motions such as pronation, neutral, or supinated bc its not attached to the Radius.

215
Q

What are the attachments of Coracobrachialis?

A

Coracoid process to the medial proximal 1/3 of the humerus. Innervated by the musculocutaneous nerve

216
Q

coracobrachilais retracts what motion occurs to the scapula?

A

shoulder flexion when the arms on the side. Adduction or horizontal adduction

217
Q

How many heads does deltoid have?

A

Anterior, middle, and posterior head

218
Q

what sort of fiber orientation is the deltoid muscle?

A

convergent muscle

219
Q

What does anterior head of deltoid do?

A

shoulder flexion, internal rotation, and horizontal adduction

220
Q

What does posterior head of deltoid do?

A

shoulder extension, external rotation, and horizontal abduction

221
Q

Abduction of the coronal plane which deltoid heads are firing?

A

All three middle, anterior, posterior. If posterior is weak or not working the abduction will leave coronal plane and vier to the anteriorly and vice versa

222
Q

What are the attachments of Pectoralis Major?

A

Body of the sternum and sternocostal cartilages ribs 2-6, and medial 1/3 of the clavicle and attaches to the crest of the greater tubercle aka lateral lip of the bicipital groove

223
Q

pectoralis major retracts what motion occurs to the shoulder?

A

internal rotation, adduction, and horizontal adduction

224
Q

what innervates the pectoralis major?

A

medial and lateral pectoral nerve

225
Q

Clavicular head of the pec major contracts then what happens?

A

When the arm is already extended, it allows for shoulder flexion up and across. Most used during the first initiation

226
Q

Sternocostal head of the pec major contracts then what happens?

A

pull the arm down to shoulder extension

Anatomy 2 (6 decks)

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