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My Gross Notes > Scapulohumeral (intrinsic Shoulder) Muscles > Flashcards

Scapulohumeral (intrinsic Shoulder) Muscles Flashcards

0
Q

Insertion of deltoid

A

Deltoid tuberosity

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1
Q

Deltoid origin

A

Lateral third of clavicle
Acromion
Spine of scapula

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2
Q

Deltoid Innervation

A

Axillary nerve C5 C6

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3
Q

Deltoid actions

A

Clavicular (anteriorly) part flexes and medially rotates shoulder joint
Acromial (middle) part abducts shoulder joint
Spine (posterior) part extends and laterally rotates

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4
Q

Supraspinous origin

A

Supraspinous fossa of scapula

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5
Q

Insertion of supraspinous

A

Superior facet of greater tubercle of humerus

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6
Q

Innervation of supraspinatus

A

Suprascapular nerve C4 C5 C6

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7
Q

Supraspinatus action

A

Initiates and assist deltoid in abduction Of shoulder joint

Acts with other rotator cuff muscles

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8
Q

Infraspinatus origin

A

infraspinous fossa of scapula

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9
Q

Infraspinatus insertion

A

Middle facet of greater tubercle of humerus

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10
Q

Infraspinatus Innervation

A

Suprascapular C5 C6

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11
Q

Action of Infraspinatus and teres minor

A

Laterally rotates shoulder joint

Helps hold humerus head in glenoid cavity of scapula

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12
Q

Teres minor origin

A

Middle part of lateral border of scapula

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13
Q

Teres minor insertion

A

Inferior facet of greater tubercle of humerus

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14
Q

Innervation of teres minor

A

Axillary nerve C5 C6

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15
Q

Teres Major origin

A

Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

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16
Q

Teres major insertion

A

medial lip of intertubercular sulcus of humerus

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17
Q

innervation of teres major

A

lower subscapular nerve C5 6

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18
Q

action of teres major

A

adducts and medially rotates shoulder joint

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19
Q

subcapularis origin

A

subscapularis fossa

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20
Q

subscapularis insertion

A

lesser tubercle of humerus

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21
Q

subscapularis innervation

A

upper and lower subscapular nerve C5 C6 C7

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22
Q

what type of joint is sternoclavicular joint

A

synovial but consider a saddle type

23
Q

where does the sternoclavicular joint articulate

A

between the sternal end of clavicle and the manubrium of the sternum and the 1st costal cartilage

24
Q

the sternoclavicular joint is divided into two components by what

A

articular disc

25
Q

the articular disc is firmly attach to what ligaments

A

anterior and posterior sternoclavicular ligaments

interclavicular ligament

26
Q

what does the articular disc serve as

A

a shock absorber of forces transmitted along the clavicle from the upper limbs

27
Q

what injury is most common in clavicles

A

fractures is most common and dislocation is rare

28
Q

how many articulations are between the upper limbs and the axial skeleton

A

just the sternoclavicular joint

29
Q

what reinforces the sternoclavicular joint anteriorly and posteriorly

A

anterior and posteriorly SC ligaments

30
Q

what does the interclavicular ligament do

A

strengthens the capsule superiorly

31
Q

costoclavicular ligament does what

A

anchors the inferior surface of sternal end of clavicle to the first rib and its costal cartilage, limiting elevation of the pectoral girdle

32
Q

the sternoclavicular joint does what

A

allows movements off the pectoral girdle and upper limbs

33
Q

during full elevation of the limb, the clavicle is raised to approx

A

60 degrees angle

34
Q

the sc joint can move anteriorly or posteriorly

A

about 30 degrees

35
Q

acromioclavicular joints is what type of joints

A

is a plane synovial articulation

36
Q

the acromioclavicular joint is formed

A

the acromial end of clavicle articulates with the acromion

37
Q

the articular surface of acromialclavicular joint is covered by what

A

fibrocartilalge, are separated by an incomplete wedge shaped articular disc

38
Q

what strengthens the Acromioclavicular joint

A

the Ac ligament, a fibrous band extending from the acromion to the clavicle

39
Q

what does the coracoclavicular ligament do

A

a strong, extra-articular

which anchors the clavicle to the coracooid process of scapula

40
Q

what is the conoid ligament

A

attached to the root of the coracoid process

wide attachment is to the conoid tubercle

41
Q

what is the trapezoid ligament

A

attached to the superior surface of the coracoid process

extends laterally and posteriorly to the trapezoid line

42
Q

what ligament allows the scapula and free limb to be suspend from the clavicle

A

coracoclavicular ligament

the acromioclavicular joint too

43
Q

what supplies the acromioclavicular joint

A

suprascapular and thoraco-acromial arteries

supraclavicular, lateral pectoral and axillary nerve

44
Q

what type of joint is the glenohumeral joint

A

is a ball and socket synovial joint but it makes it unstable

45
Q

what does the glenoid labrum do

A

deepens the glenoid cavity slightly

46
Q

what holds the humerus head in the cavity

A

the tonus of the muscuotendinous rotator cuff

47
Q

the glenohumeral strengthens what

A

the anterior aspect of the capsule

48
Q

glenohumeral ligament is what type of ligament

A

intrinsic

49
Q

the coracohumeral ligament strengthens what

A

the capsule superiorly

passes from the base of the coracoid process to the anterior aspect of the greater tubercle

50
Q

what ligament converts the sulcus to a canal for the tendon of the long head of bicep

A

transverse humeral ligament

51
Q

coraco-acromial arch is formed by what

A

its intrinsic protective structure

formed by inferior aspect of the acromion and coracoid process of the scapula with the coracoacromial ligament

52
Q

what prevents the superior displacement from the gleniod cavity

A

coracoacromial ligament

53
Q

What movement can the glenohumeral joint allows

A

Movement around the three axes and permits flexion, extension, abduction-adduction and circumduction

54
Q

What increases range of abduction for glenohumeral joint

A

Lateral rotation

55
Q

What muscles move the glenohumeral joint

A

Axio-appendicular muscles
Scapulohumeral muscles act directly on it
Shunt muscles- acting to resist dislocation

56
Q

What is the glenohumeral joint supplied by

A

Anterior and posterior circumflex humeral arteries and branches of the suprascapular artery

Suprascapular, axillary, lateral pectoral nerve

My Gross Notes (12 decks)

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