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MSK Exam 2 > Lecture 10: Upper Extremity Myology > Flashcards

Lecture 10: Upper Extremity Myology Flashcards

1
Q

Pectoralis Major M.

What are the attachments?

A

Origin: Claviclular Head, Sheath of Rectus Abdominis, Clavical, Sternum

Insertion: Lateral Edge of the Intertubercular Groove of Humerus

(covers the long head of Biceps Brachii M)

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2
Q

Pectoralis Major M.

What are the major actions?

A
  1. Adduct and Medially Rotate Humerus
  2. Protract and Depress Scapula
  3. Clavicular Head: Flex Humerus
  4. Sternocostal Head: Extend Humerus from flexed state
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3
Q

Pectoralis Major M.

What is the innervation and blod supply?

A

Innervation: Lateral and Medial Pectoral Nerve

Blood Supply: Pectoral Branch of the Thoracoacromial Trunk

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4
Q

Pectoralis Minor M.

What are the attachments?

A

Origin: Medial aspect of Ribs 3-5

Insertion: Coracoid Process of the Scapula

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5
Q

Pectoralis Minor M.

What is the action?

A

Stabilizes the Scapula by holding it to thoracic wall

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6
Q

Pectoralis Minor M.

What is the innervation and blood supply?

A

Innervation: Medial Pectoral Nerve

(It gets pity innervated on the way to the Pectoralis Major M.)

Blood Supply: Pectoral Branch of the Throacoacromial Trunk

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7
Q

Subclavius M.

What are the attachments?

A

Origin: Upper border of 1st rib and 1st Costal Cartilage

Insertion: Inferior aspect of the Clavicle

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8
Q

Subclavius M.

What is the Action?

A

Depresses the Clavicle

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9
Q

Subclavius M.

What is the innervation and blood supply?

A

Innervation: Nerve to the Subclavius

Blood Supply: Clavicular Branch of the Thoracoacromial Trunk

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10
Q

Serratus Anterior M.

What are the attachments?

A

Origin: Lateral external surface of Ribs 1-8

Insertion: Anterior surface of medial border of scapula

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11
Q

Serratus Anterior M.

What are the actions?

A
  1. Protraction of the Scapula
    * (Boxer’s Serratus Anterior Muscles are buff for this reason)*
  2. Superior Rotation of the Glenoid Cavity
    * (Pulls the medial border down towards the ribs - lateral end goes up)*
  3. Stabalizes the Scapula by pulling it to the Thoracic Wall
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12
Q

Serratus Anterior M.

What is the innervation and blood supply?

A

Innervation: Long Thoracic Nerve

Blood Supply: Lateral Thoracic Artery

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13
Q

If the Serratus Anterior or Long Thoracic Nerve is damaged, what can it cause and what motion does this prevent?

A

“Winging” of the Scapula

  • Scapula is no longer Stabalized against the Thoracic Wall
  • Abduction of the Upper Extremity beyond the Horizontal Position
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14
Q

Deltoid Muscle

What are the Attachments?

A

Origin: Lateral Clavicle, Scapular Spine, and Acromion

Insertion: Deltoid Tuberosity of the Humerus

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15
Q

Deltoid Muscle

What are the actions?

A

Anterior Part: Flex and Medial Rotation of the Humerus

Middle Part/Whole Muscle: Abduction of the Humerus

Posterior Part: Extension of the Shoulder and Lateral Rotation of the Humerus

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16
Q

Deltoid Muscle

What is the innervation and blood supply?

A

Innervation: Axillary Nerve

Blood Supply: Posterior Circumflex Humeral Artery (main)

Deltoid Branch of Thoracoacromial Artery

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17
Q

Subscapularis Muscle

What are the attachments?

A

Orign: Medial Aspect Subscapular Fossa

Insertion: Lesser Tubercle of the Humerus

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18
Q

Subscapularis Muscle

What are its actions?

A
  1. Medial Rotation of the Humerus
  2. Adduction of the Humerus
  3. Holds humeral head in glenoid cavity
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19
Q

For the Subscapularis M.

What is the innervation and blood supply?

A

Innervation: Upper and Lower Subscapular Nerve

Blood Supply: Subscapular Artery

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20
Q

Supraspinatus Muscle

What are the attachments?

A

Origin: Supraspinous Fossa of the Scapula

Insertion: Greater Humeral Tubercle (running over the superior-most part of the Humerus)

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21
Q

Supraspinatus Muscle

What is the action?

A
  1. Abduction of the Humerus (along with deltoids)
  2. Holds Humeral Head in Glenoid Cavity
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22
Q

Supraspinatus Muscle

What is the innervation and blood supply?

A

Innervation: Suprascapular Nerve

Blood Supply: Suprascapular Artery

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23
Q

Infraspinatus Muscle

What are the attachments?

A

Origin: Infraspinous Fossa of Scapula

Insertion: Greater Tubercle of the Humerus

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24
Q

Infraspinatus Muscle

What is its action?

A
  1. Lateral Rotation of the Humerus
  2. Holds Humeral Head in Glenoid Cavity
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25
Q

Infraspinatus Musle

What is the innervation and blood supply?

A

Innervation: Suprascapular Nerve

Blood Supply: Suprascapular Artery and Circumflex Scapular Artery

(The Circumflex Scapular Artery comes around the lateral border of the scapula and heads superiorly and medially)

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26
Q

Teres Minor Muscle

What are the attachments?

A

Origin: Middle Part of Lateral Border of Scapula

Insertion: Greater Tubercle of Humerus

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27
Q

Teres Minor Muscle

What are its actions?

A
  1. Laterally Rotates Humerus
  2. Holds Humeral Head in Glenoid Cavity
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28
Q

Teres Minor Muscle

What is the innervation and blood supply?

A

Nerve: Axillary Nerve

Blood Supply: Circumflex Scapular Artery and Subscapular Artery

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29
Q

Teres Major Muscle

What are the attachments?

A

Origin: Posterior aspect of Inferior Angle of the Scapula

Insertion: Medial edge of Intertubercular groove

(Front of the Humerus)

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30
Q

Teres Major Muscle

What are the actions?

A
  1. Medial rotation of the Humerus

(Pulls the front of the Humerus medially)

  1. Adduction of the Humerus
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31
Q

Teres Major Muscle

What is the innervation and blood supply?

A

Innervation: Lower Subscapular Nerve

Blood Supply: Subscapular Artery and Circumflex Scapular Artery

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32
Q

What are the four rotator cuff muscles?

A

Supraspinatus M.

Infraspinatus M.

Teres Minor M.

Subscapularis M.

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33
Q

Triangular Space

What muscles make up the border?

What can be found within?

A

Borders: Teres Major, Teres Minor, Long Head of Triceps Brachii M.

Contains: Circumflex Scapular Artery and Vein

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34
Q

Quadrangular Space

What muscles make up the four borders?

What can be found within?

A

Borders: Long and Lateral Head of the Triceps Brachii M., Teres Major M. Teres Minor M.

Contains: Axillary Artery, Posterior Circumflex Humeral Artery, Posterior Circumflex Humeral Vein

(Contents are headed to the Deltoid Muscle, so if you remember the Deltoid M.’s nerve and artery, there you go)

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35
Q

Triangular Interval

What muscles make up its three borders?

What does it contain?

A

Borders: Long and Lateral Head of the Triceps Brachii, Teres Major M.

Contains: Deep Brachial Artery and Vein, Radial Nerve

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36
Q

What part of the Biceps Brachii M. covers the Pronator Teres M.?

A

The Bicipital Aponeurosis

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37
Q

Biceps Brachii Muscle

What are the attachments?

A

Origin: Long Head: Supraglenoid Tubercle of Scapula

Short Head: Coracoid Process of Scapula

Insertion: Radial Tuberosity and Antebrachial Fascia (bicipital aponeurosis)

The Biceps Brachii skips the Humerus entirely

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38
Q

Biceps Brachii Muscle

What are the actions?

A
  1. Flexes humerus and supinated forearm
  2. Supinates forearm
  3. Short Head resists dislocation of shoulder
    * Remember that these Muscles Flex/Extend the Joints they cross*
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39
Q

Biceps Brachii Muscle

What is the innervation and blood supply?

A

Innervation: Musculocutaneous Nerve

Blood Supply: Brachial Artery

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40
Q

Coracobrachialis Muscle

What are the attachments?

A

Origin: Coracoid Process of Scapula

Insertion: Medial Aspect of the Humeral Body

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41
Q

Coracobrachialis Muscle

What are the actions?

A
  1. Flexion of Shoulder
  2. Adduction of Shoulder
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42
Q

Coracobrachialis Muscle

What is the innervation and blood supply?

A

Innervation: Musculocutaneous Nerve

Blood Supply: Brachial Artery

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43
Q

Brachialis Muscle

What are the attachments?

A

Origin: Distal half of anterior aspect of Humerus

Insertion: Ulnar Tuberosity and Coranoid Process

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44
Q

Brachialis Muscle

What is the action?

A

Flexion of the Forearm (elbow joint)

The Bicep cannot flex a pronated Elbow. The Brachialis does that.

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45
Q

Brachialis Muscle

What is the innervation and blood supply?

A

Innervation: Musculocutaneous Nerve

Blood Supply: Radial Recurrent Artery

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46
Q

Triceps Brachii Muscle

Where are the attachments?

A

Origin: Long Head: Infraglenoid Tubercle of Scaupla

Lateral Head: Posterior aspect of Humerus (superior to radial groove)

Medial Head: Posterior aspect of Humerus (inferior to radial groove)

Insertion: Olecranon of Ulna and Antebrachial Fascia

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47
Q

Triceps Brachii Muscle

What is the action?

A
  1. Extend the Forearm
  2. Long Head resists dislocation of shoulder
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48
Q

Triceps Brachii Muscle

What is the innervation and blood supply?

A

Innervation: Radial Nerve

Blood Supply: Deep Brachial Artery

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49
Q

Anconeus Muscle

What are the attachments?

A

Origin: Lateral Humeral Epicondyle

Insertion: lateral aspect of Olecranon

(Even though it attaches to the Lateral Humeral Epicondyle like an extensor and exists entirely in the forearm, it’s considered a posterior compartment Brachial Muscle for this class. This may be because some people consider it to be a continuation of Triceps Brachii M.)

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50
Q

Anconeus Muscle

What is the action?

A
  1. Extends the forearm (elbow)
  2. Stabilizes elbow joint
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51
Q

Anconeus Muscle

What is the innervation and blood supply?

A

Innervation: Radial Nerve

Blood Supply: Deep Brachial Artery

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52
Q

Pronator Teres Muscle

What are the attachements?

A

Origin: Humeral Head: Medial Epicondyle of Humerus

Ulnar Head: Coranoid Process of Ulna

Insertion: Lateral aspect of the Radius

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53
Q

Pronator Teres Muscle

What is the action?

A

Pronate and Flex forearm (Elbow)

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54
Q

Pronator Teres Muscle

What is the innervation and blood supply?

A

Innervation: Median Nerve

Blood Supply: Ulnar Artery and Radial Artery

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55
Q

Flexor Carpi Radialis Muscle

What are the attachments?

A

Origin: Medial Humeral Epicondyle

Insertion: Base of 2nd Metacarpal on palmar aspect

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56
Q

Flexor Carpi Radialis Muscle

What are the actions?

A
  1. Flex forearm and hand
  2. Abduct the Wrist
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57
Q

Flexor Carpi Radialis Muslce

What is the innervation and blood supply?

A

Innervation: Median Nerve

Blood Supply: Ulnar Artery

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58
Q

Palmaris Longus Muscle

What are the attachments?

A

Origin: Medial Humeral Epicondyle

Insertion: Palmar Aponeurosis and Flexor Retinaculum

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59
Q

Palmaris Longus Muscle

What is the action?

A
  1. Flexes forearm and hand
  2. Tenses Palmar Aponeurosis
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60
Q

Palmaris Longus Muscle

What is the innervation and blood supply?

A

Innervation: Median Nerve

Blood Supply: Ulnar Artery

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61
Q

Flexor Carpi Ulnaris Muscle

What are the attachements?

A

Origin: Humeral Head: Medial Humeral Epicondyle

Ulnar Head: Olecranon and Posterior Ulna

Insertion: Pisiform Bone, Hook of the Hamate, Base of 5th Metacarpal (palmar aspect)

(Inserts everywhere in the medial Wrist)

62
Q

Flexor Carpi Ulnaris Muscle

What are the actions?

A
  1. Flexion of forearm and hand at wrist
  2. Adduction of hand at wrist
63
Q

Flexor Carpi Ulnaris Muscle

What is the innervation and blood supply?

A

Innervation: Ulnar Nerve

Blood Supply: Ulnar Artery

64
Q

Flexor Digitorum Superficialis Muscle

What are the attachements?

A

Onset: Humeroulnar Head: Medial Humeral Epicondyle

Coronoid Process of the Ulna

Radial Head: Superior portion of the anterior Radius

Insertion: Intermediate Phalanges of digits 2-5 at metacarpophlangeal and proximal interphalangeal joints (anterior aspect)

Insertion is Bifid

65
Q

Flexor Digitorum Superficialis Muscle

What are the actions?

A

Flexion of the joints it crosses

-Flexes forearm, hand at wrist, proximal and intermediate phalanges of digits 2-5

66
Q

Flexor Digitorum Superficialis Muscle

What is the innervation and blood supply?

A

Innervation: Median Nerve

Blood Supply: Ulnar Artery

67
Q

Flexor Digitorum Profundus Muscle

What are the attachments?

A

Origin: Proximal Ulna and Interosseous Membrane

Insertion: Palmar Aspect of Distal Phalanges of Digits 2-5

Tendon passes through bifid of superficialis

68
Q

Flexor Digitorum Profundus Muscle

What are the actions?

A

Flex hand at wrist, all phalanges of digits 2-5 at all joints

Does not flex forearm (elbow)

69
Q

Flexor Digitorum Profundus Muscle

What is the innervation and bood supply?

A

Innervation: Medial Portion: Ulnar Nerve

  • Lateral portion:* Median Nerve
  • Its medial portion is directly underneath the ulnar nerve, so it kind of gets accidentally innervated.*

Blood Supply: Ulnar Artery and Anterior Interosseous Artery

70
Q

Flexor Pollicis Longus Muscle

What are the attachments?

A

Origin: Radius and Interosseous Membrane

Insertion: Palmar aspect of the base of Distal Phalanx of the Thumb

71
Q

For the Flexor Pollicis Longus Muscle

What is the action?

A
  1. Flexes hand and thumb
  2. Abduct thumb at 1st carpometacarpal joint
72
Q

Flexor Pollicus Longus Muscle

What is the innervation and blood supply?

A

Innervation: Anterior Interosseous Nerve (branch of the Median Nerve)

Blood Supply: Anterior Interosseous Artery

73
Q

Pronator Quadratus Muscle

What are the attachments?

A

Origin: Anterior Aspect of Distal Ulna

Insertion: Anterior Aspect of Distal Radius

74
Q

Pronator Quadratus Muscle

What is the action?

A
  1. Pronation of forearm
  2. Holds the Ulna and Radius together
75
Q

Pronator Quadratus Muscle

What is the innervation and blood supply?

A

Innervation: Anterior Interosseous Nerve

Blood Supply: Anterior Interosseous Artery

76
Q

The radial nerve innervates what two superficial antebrachial extensors? (before it changes names)

A
  1. Brachioradialis M.
  2. Extensor Carpi Radialis Longus M.
77
Q

The deep radial nerve innervates what two antebrachial extensors?

A
  1. Extensor Carpi Radialis Brevis M.
  2. Supinator M.
78
Q

The Posterior Interosseous Nerve innervates what three antebrachial extensors?

A
  1. Extensor Digitorum M.
  2. Extensor Digiti Minimi M.
  3. Extensor Carpi Ulnaris M.
79
Q

Brachioradialis Muscle

What are the attachments?

A

Origin: Lateral Humeral Supracondylar Ridge

Insertion: Lateral aspect of distal Radius

80
Q

Brachioradialis Muscle

What is the action?

A
  1. Flexes forearm (Elbow) when the Arm is “Mid-Pronated”

(When the thumb is facing up)

81
Q

Brachioradialis Muscle

What is the innervation and blood supply?

A

Innervation: Radial Nerve

Blood Supply: Radial Reccurent Artery

82
Q

Extensor Carpi Radialis Longus Muscle

What are the attachments?

A

Origin: Lateral Humeral Supracondylar Ridge

Insertion: Dorsal aspect of the base of 2nd Metacarpal Digit

83
Q

Extensor Carpi Radialis Longus Muscle

What is the action?

A
  1. Extension hand at wrist
  2. Abduct hand at wrist (during fist clenching)
84
Q

Extensor Carpi Radialis Longus Muscle

What is the innervation and blood supply?

A

Innervation: Radial Nerve

Blood Supply: Radial Artery

85
Q

Extensor Carpi Radialis Brevis Muscle

What are the attachments?

A

Origin: Lateral Humeral Epicondyle

Insertion: Dorsal Aspect of 3rd Metacarpal Base

86
Q

Extensor Carpi Radialis Brevis Muscle

What are the actions?

A
  1. Extension of hand at wrist
  2. Abduction of hand at wrist
87
Q

Extensor Carpi Radialis Brevis Muscle

What is the innervation and blood supply?

A

Innervation: Deep Radial Nerve

Blood Supply: Radial Artery

88
Q

Extensor Digitorum Muscle

What are the attachments?

A

Onset: Lateral Humeral Epicondyle

Insertion: Extensor Expansions of Digits 2-5

89
Q

Extensor Digitorum Muscle

What is the action?

A

Extension of hand at wrist and 2nd-5th phalanges at every joint

90
Q

Extensor Digitorum Muscle

What is the innervation and blood supply?

A

Innervation: Posterior Interossious Nerve

(comes from the Radial Nerve)

Blood Supply: Posterior Interossious Artery

91
Q

When does the Deep Radial Nerve become the Posterior Interosseous Nerve?

A

After it ducks under the Supinator and emerges again

92
Q

Extensor Digiti Minimi Muscle

What are the attachments?

A

Onset: Lateral Humeral Epicondyle

Insertion: Extensor Expansion of Digit 5

93
Q

Extensor Digiti Minimi Muscle

What is the action?

A

Extends 5th Digit at all joints

94
Q

Extensor Digiti Minimi Muscle

What is the innervation and blood supply?

A

Innervation: Posterior Interosseous Nerve

Blood Supply: Posterior Interosseous Artery

95
Q

Extensor Carpi Ulnaris Muscle

What are the attachements?

A

Origin: Lateral Humeral Epicondyle

Insertion: Dorsal aspect of 5th Metacarpal Base

96
Q

Extensor Carpi Ulnaris Muscle

What is the action?

A
  1. Extension of hand at wrist
  2. Adduction of hand at wrist
97
Q

Extensor Carpi Ulnaris Muscle

What is the innervation and blood supply?

A

Innervation: Posterior Interosseous Nerve

This is tough because it has Ulnar in the name, but remember that exception is only true on the Flexor side. ALL of the Extensors of the arm are innervated by the Radial Nerve, or a branch thereof.

Blood Supply: Ulnar Artery

98
Q

Repetitive use of the superficial extensor muscles of the forearm can cause what?

A

Elbow Tendinitis or “Tennis Elbow”

-pain over lateral epicondyle and down posterior forearm

99
Q

Supinator Muscle

What are the Attachments?

A

Origin: Lateral Humeral Epicondyle, Radial Collateral Ligament of the Elbow, Annular Ligament, Supinator Crest and Fossa of the Ulna

Insertion: Proximal aspect of Radius

100
Q

Supinator Muscle

What is the aciton?

A

Supinate Forearm

101
Q

Supinator Muscle

What is the innervation and blood supply?

A

Innervation: Deep Radial Nerve

Blood Supply: Radial Recurrent Artery

102
Q

Extensor Indicis Muscle

What are the attachments?

A

Origin: Posterior aspect of Distal Ulna and Interosseous Membrane

Insertion: Extensor Expansion of Digit 2

103
Q

Extensor Indicis Muscle

What is the action?

A

Extend hand at wrist and extend 2nd Digit (Index Finger)

104
Q

Extensor Indicis Muscle

What is the innervation and blood supply?

A

Innervation: Posterior Interosseous Nerve

Blood Supply: Posterior Interosseous Artery

105
Q

Abductor Pollicis Longus Muscle

What are the attachements?

A

Origin: Posterior aspect of proximal Ulna, Radius, Interosseous Membrane

Insertion: Base of 1st Digit Metacarpal

106
Q

Abductor Pollicis Longus Muscle

What is the action?

A

Abduction of hand at wrist and Thumb at carpometacarpal joint

107
Q

Abductor Pollicis Longus Muscle

What is the innervation and blood supply?

A

Innervation: Posterior Interosseous Nerve

(This is an outcropping muscle, but they are innervated like the extensors)

Blood Supply: Posterior Interosseous Artery

108
Q

Extensor Pollicis Longus Muscle

What are the attachments?

What is interesting about the Tendon for this Muscle?

A

Origin: Posterior aspect of Ulna and Interosseous Membrane

Insertion: Dorsal aspect Base of the Distal Phalanx of the thumb.

Extensor Pollicis Longus M. goes to the Distal Phalanx, Extensor Pollicis Brevis M. goes to the Proximal Phalanx

The Tendon wraps around the Dorsal Radial Tubercle and uses it as a pulley.

109
Q

Extensor Pollicis Longus Muscle

What is the action?

A
  1. Extension of the Thumb at all joints
  2. Abduction of the Wrist
110
Q

Extensor Pollicis Longus Muscle

What is the innervation and blood supply?

A

Innervation: Posterior Interosseous Nerve

Blood Supply: Posterior Interosseous Artery

111
Q

Extensor Pollicis Brevis Muscle

What are the attachments?

A

Origin: Posterior aspect of Radius and Interosseous Membrane

Insertion: Dorsal aspect of the base of the Proximal Phalanx of Thumb

112
Q

Extensor Pollicis Brevis Muscle

What are the actions?

A
  1. Extends Thumb
  2. Abducts hand at wrist
113
Q

Extensor Pollicis Brevis Muscle

What is the innervation and blood supplt?

A

Innervation: Posterior Interosseous Nerve

Blood Supply: Posterior Interosseous Artery

114
Q

What are the borders for the Anatomical Snuff Box?

What are its contents?

A

Lateral Border: Extensor Pollicis Brevis Tendon and Abductor Pollicis Longus

Medial Border: Extensor Pollicis Longus Tendon

The shorter Muscle has to be closer to the Thumb (lateral side)

Contents: Radial Artery (deep tendons) and Superficial Radial Nerve

115
Q

Abductor Pollicis Brevis Muscle

What are the attachments?

A

Origin: Tubercles of Scaphoid and Trapezium bones and Flexor Retinaculum

Insertion: Lateral aspect of Base of the Proximal Phalanx of the Thumb

116
Q

Abductor Pollicis Brevis Muscle

What is the action?

A
  1. Abducts the Thumb
  2. Helps with Opposition
117
Q

Abductor Pollicis Brevis Muscle

What is the innervation and blood supply?

A

Innervation: Recurrant Branch of the Median Nerve

Blood Supply: Radial Artery

118
Q

Opponens Pollicis Muscle

What are the attachments?

A

Origin: Tubercles of Scaphoid and Trapezium bones and Flexor Retinaculum

Insertion: Lateral Aspect of 1st Metacarpal

119
Q

Opponens Pollicis Muscle

What is the action?

A

Opposition of the Thumb

120
Q

Opponens Pollicis Muscle

What is the innervation and blood supply?

A

Innervation: Recurrent Branch of the Median Nerve

This is the O in 1/2 LOAF 1/2

Blood Supply: Radial Artery

121
Q

Flexor Pollicis Brevis Muscle

What are the attachments?

A

Origin: Tubercles of Scaphoid and Trapezium bones and Flexor Retinaculum

Insertion: Lateral aspect of thumb

122
Q

Flexor Pollicis Brevis Muscle

What is the action?

A

Flexes the Metacarpal and the Proximal Phalanx of the Thumb

123
Q

Flexor Pollicis Brevis Muscle

What is the innervation and blood supply?

A

Innervation:

Superficial Head: Recurrent Branch of the Median Nerve

Deep Head: Deep Ulnar Nerve

This is the “F 1/2” in “1/2 LOAF 1/2”

Blood Supply: Radial Artery

124
Q

Adductor Pollicis Muscle

What are the attachments?

A

Origin:

Oblique Head: Capitate and Bases 2nd and 3rd Metacarpal bones

Transverse Head: Palmar aspect of Body of the 3rd Metacarpal bone

Insertion: Medial aspect of proximal phalanx of thumb

125
Q

Adductor Pollicis Muscle

What is the action?

A

Adduction of thumb

126
Q

Adductor Pollicis Muscle

What is the innervation and blood supply?

A

Innervation: Deep Ulnar Nerve

Blood Supply: Deep Palmar Anterior Arch

127
Q

How do the thenar muscles look like together?

128
Q

A superficial injury to the Thenar Eminence can damage what nerve?

What does this impede?

A

Recurrent Branch of the Median Nerve

Many of the Thumb Muscles

129
Q

Abductor Digiti Minimi Muscle

What are the attachments?

A

Origin: Pisiform Bone

Insertion: Medial aspect of the base of the Proximal Phalanx of the 5th Digit

130
Q

Abductor Digiti Minimi Muscle

What is the action?

A

Abduction of the pinkie finger

131
Q

Abductor Digiti Minimi Muscle

What is the innervation and bood supply?

A

Innervation: Deep Ulnar Nerve

Blood Supply: Ulnar Artery

132
Q

Flexor Digiti Minimi Muscle

What are the attachments?

A

Origin: Hook of the Hamate and Flexor Retinaculum

Insertion: Medial aspect of the Base of the Proximal Phalanx of the 5th Digit

133
Q

Flexor Digiti Minimi Muscle

What is the action?

A

Flexes the 5th Digit

134
Q

Flexor Digiti Minimi Muscle

What is the innervation and blood supply?

A

Innervation: Deep Ulnar Nerve

Blood Supply: Ulnar Artery

135
Q

Opponens Digiti Minimi Muscle

What is the attachment?

A

Origin: Hook of the Hamate and Flexor Retinaculum

Insertion: Middle of the 5th Metacarpal

136
Q

Opponens Digiti Minimi Muscle

What is the action?

A

Opposition of the 5th Digit

137
Q

Opponens Digiti Minimi Muscle

What is the innervation and blood supply?

A

Innervation: Deep Ulnar Nerve

Blood Supply: Ulnar Artery

138
Q

What do hypothenar muscles look like together?

139
Q

1st and 2nd Lumbrical Muscles

What are their attachments?

A

Origin: Lateral side of the lateral two Flexor Digitorum Profundus Tendons

Insertion: Radial aspect of Extensor Expansion of the 2nd and 3rd digits

He made a big deal about these originating at a tendon in class

140
Q

1st and 2nd Lumbrical Muscles

What is their action?

A
  1. Flex proximal phalanges of index and middle fingers at metacarpophalangeal joint
  2. Extend intermediate and distal phalanges of index and middle fingers by tightening extensor expansion
141
Q

1st and 2nd Lumbrical Muscles

What are their innervations and blood supply?

A

Innervation: Recurrant Branch of the Median Nerve

Blood Supply: Superficial Palmar Arch, Common Palmar Digital aa., Deep Palmar Arch, Dorsal Digital aa.

142
Q

3rd and 4th Lumbrical Muscles

What are their attachments?

A

Origin: Between medial three Flexor Digitorum Profundus Tendons (bipennate)

Insertion: Radial aspect of Extensor Expansion of the 4th and 5th digits

143
Q

3rd and 4th Lumbrical Muscles

What is their action?

A
  1. Flex proximal phalanges of ring and pinkie fingers at metacarpophalangeal joint
  2. Extend intermediate and distal phalanges of ring and pinkie fingers by tightening extensor expansion
144
Q

3rd and 4th Lumbrical Muscles

What are their innervations and blood supply?

A

Innervation: Deep Ulnar Nerve

Blood Supply: Superficial Palmar Arch, Common Palmar Digital aa., Deep Palmar Arch, Dorsal Digital aa.

145
Q

Dorsal Interosseous Muscles

What are their attachments?

How many of these do we have?

A

Origin: Adjacent sides of two metacarpals (bipennete)

Insertion: Bases of proximal phlanges and extensor expansion of digits 2-4

Go between a given digit, and the digit closer to the middle finger (Eg. 1st Digit to 2nd Digit, but 5th Digit to 4th Digit)

Total: 4 Dorsal Inerosseous Muscles

  • 2nd and 4th digits have one each
  • 3rd digit abducts both ways and has two.
  • The thumb and pinky have their own abductors*
146
Q

Dorsal Interosseous Muscles

What is their action?

A

Abduction of the 2nd-4th digits

DAB Dorsals ABduct

147
Q

Dorsal Interosseous Muscles

What is the innervation?

A

Innervation: Deep Ulnar Nerve

Blood Supply: Dorsal and Palmar Metacarpal aa.

148
Q

Palmar Interosseous Muscles

What are their attachments?

How many do we have?

A

Origin: Palmar aspect of 2nd, 4th, and 5th metacarpal bones

Insertion: Bases of proximal phalanges and extensor expansions of 2nd, 4th, and 5th digits

Total of 3 Palmar Interosseous Muscles

  • One for each of the 2nd, 4th, and 5th digits
  • The Thumb has its own Adductors Pollicis, and the Third Digit doesn’t adduct, it can only abduct in either direction.*
149
Q

Palmar Interosseous Muscles

What is their action?

A

Adduction of the 2nd-4th digits

PAD Palmar ADduct

150
Q

Palmar Interosseous Muscles

What is the innervation and blood supply?

A

Innervation: Deep Ulnar Nerve

Blood Supply: Palmar Metacarpal aa.

MSK Exam 2 (22 decks)

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