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MSA > Shoulder Muscles > Flashcards

Shoulder Muscles Flashcards

1
Q

ORIGIN of the coracobrachialis

A

apex of coracoid process of scapula

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2
Q

INSERTION of the coracobrachialis

A

medial surface of the middle shaft of the humerus, opposite deltoid tubersoity (so insertion is posterior)

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3
Q

ACTION of the coracobrachialis

A

flexes and adducts the shoulder joint

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4
Q

INNERVATION of the coracobrachialis

A

musculocutaneous nerve

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5
Q

ORIGIN of the pectoralis major

A

clavicular head, sternocostal head, superior 6 costal cartilages, aponeurosis of external oblique

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6
Q

INSERTION of the pectoralis major

A

lateral lip of intertubercular groove of humerus

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7
Q

ACTION of the pectoralis major

A

adducts and medially rotates the humerus, elevation of sternum

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8
Q

INNERVATION of the pectoralis major

A

clavicular head, lateral pectoral nerve (c5-c7)

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9
Q

ORIGIN of the biceps

A

short head: tip of coracoid process
long head: supraglenoid tubercle of scapula, capsule of glenohumeral joint and labrum

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10
Q

INSERTION of the biceps

A

tuberosity of radius, fascia of forearm via bicipital aponeurosis

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11
Q

ACTION of the biceps

A

supinates forearm

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12
Q

INNERVATION of the biceps

A

musculocutaneous nerve (c5-c6)

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13
Q

ORIGIN of the teres major

A

dorsal or posterior surfaces of inferior angle, lower 1/3 of scapulas lateral border

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14
Q

INSERTION of the teres major

A

same as pec major, inner ridge of intertubercular ridge at the top of the humerus

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15
Q

ACTION of the teres major

A

medially rotates, adducts and extends the shoulder joint

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16
Q

INNERVATION of the teres major

A

lower scapular nerve (c5, 6 and 7)

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17
Q

INSERTION of latissimus dorsi

A

same as pec major and teres major, floor if intertubercular groove of humerus

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18
Q

ORIGIN of latissimus dorsi

A

spinous process of t6-t12, thoracolumbar fascia, sacral and lumbar vertebrae, iliac crest, inferior angle of scapula

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19
Q

INNERVATION of latissimus dorsi

A

thoracodorsal nerve (c6,7,8)

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20
Q

ORIGIN of the triceps

A

long head: infraglenoid tubercle of scapula
lateral head: posterior surface of humerus (inferior to radial groove)

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21
Q

INSERTION of the triceps

A

proximal end of olecranon of ulna, capsule of elbow joint, antebrachial fascia

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22
Q

ACTION of the triceps

A

holds head of the humerus in the glenoid cavity

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23
Q

INNERVATION of the triceps

A

radial nerve (c6-8)

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24
Q

ORIGIN of the supraspinatus

A

medial 2/3 supraspinatus fossa of scapula

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25
Q

INSERTION of the supraspinatus

A

superior facet of greater tuberosity of humerus

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26
Q

ACTION of the supraspinatus

A

abducts shoulder joint , stabilizes head of humerus in the glenoid cavity during movements

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27
Q

INNERVATION of the supraspinatus

A

suprascapular nerve

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28
Q

ORIGIN of the infraspinatus

A

medial 2/3 of infraspinatus fossa of scapula

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29
Q

INSERTION of the infraspinatus

A

middle facet of greater tubercle of humerus

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30
Q

ACTION of the infraspinatus

A

lateral rotation of upper limbs at the shoulder

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31
Q

INNERVATION of the infraspinatus

A

suprascapular nerve, same as supraspinatus

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32
Q

ACTION of middle deltoid

A

abduction of shoulder joint by middle fibers, anterior and posterior fibers help stabilize fibers

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33
Q

INNERVATION of middle deltoid

A

axillary nerve (c5-6)

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34
Q

ORIGIN of the subscapularis subscapular nerve

A

subscapular fossa of scapula

35
Q

ACTION of the subscapularis subscapular nerve

A

medially rotates shoulder joint, stabilizes head of humerus in glenoid cavity during movements

36
Q

ORIGIN of the teres minor

A

upper 2/3 of dorsal surface of lateral border of scapula

37
Q

ACTION of the teres minor

A

laterally rotates shoulder joint, stabilizes head of humerus with movements regarding the glenohumeral joint, kinda same as subscapularis subscapular nerve

38
Q

INNERVATION of the teres minor

A

axillary nerve

39
Q

what are the four rotator cuff muscles

A

supraspinatus, infraspinatus, subscapularis, teres minor

40
Q

what action do all rotator cuff muscles share

A

stabilizing during movement, supraspinatus also helps w/ abduction

41
Q

what rotator cuff muscles actually rotate

A

infraspinatus (external), teres minor (external), subscapularis (internal)

42
Q

elevation uses what muscles
(scapular motion)

A

(upper/descending) trapezius, levator scapulae, rhomboids

43
Q

depression uses what muscles
(scapular motion)

A

(lower/ascending) trapezius

44
Q

adduction/retraction uses what muscles
(scapular motion)

A

(middle/transverse) trapezius, rhomboids

45
Q

abduction/protraction uses what muscles
(scapular motion)

A

serratus anterior, pectoralis minor

46
Q

ORIGIN of the upper trapezius

A

external occipital protuberance, medial 1/3 superior nuchal line, ligamentum nuchae, c7 spinous process

47
Q

INSERTION of the upper trapezius

A

lateral 1/3 of clavicle, acromion process

48
Q

ACTION of the upper trapezius

A

elevation of scapula and shoulder, captial extension, cervical extension, rotation of head to opposite side, upward rotation of scapula

49
Q

INNERVATION of the upper trapezius

A

cranial nerve

50
Q

ORIGIN of the levator scapulae

A

transverse processes of c1-4

51
Q

INSERTION of the levator scapulae

A

superior arch of scapula

52
Q

ACTION of the levator scapulae

A

assists in rotation, lateral flexes cervical vertebrae, same-side rotation, cervical extension

53
Q

INNERVATION of the levator scapulae

A

cervical and dorsal scapular nerve

54
Q

ORIGIN of the rhomboids major

A

spinous processes t2-5

55
Q

INSERTION of the rhomboids major

A

fibrous attachment to medial scapular border between spine and scapular angle

56
Q

ACTION of the rhomboids major

A

helps hold scapula (and thus, the upper limb) onto the ribcage

57
Q

INNERVATION of the rhomboids major

A

dorsal scapular nerve (c4-5)

58
Q

ORIGIN of the rhomboids minor

A

ligamentum nuchae, spinous process c7 and t1

59
Q

INSERTION of the rhomboids minor

A

medial border at the root of the spine of the scapula

60
Q

ACTION of the rhomboids minor

A

retracts the scapula when the trapezius is being contracted

61
Q

INNERVATION of the rhomboids minor

A

same as rhomb. major, dorsal scapular nerve (c4-5)

62
Q

ORIGIN of the lower trapezius

A

spinous process of t6-t12

63
Q

INSERTION of the lower trapezius

A

tubercle at the apex of the spine of the scapula

64
Q

ACTION of the lower trapezius

A

scapular adduction, depression and upward rotation

65
Q

INNERVATION of the lower trapezius

A

spinal nerves of c3-4, accessory nerve

66
Q

ORIGIN of the middle trapezius

A

spinous processes t1-5

67
Q

INSERTION of the middle trapezius

A

medial margin of acromion, spine of scapula, crest of superior scapular lip

68
Q

ACTION of the middle trapezius

A

to draw the acromion, clavicle and spine of scapula medially during contraction

69
Q

INNERVATION of the middle trapezius

A

accessory nerve (CN XI)

70
Q

ORIGIN of the serratus anterior

A

external surfaces of lateral parts of ribs 1-8

71
Q

INSERTION of the serratus anterior

A

anterior surface of medial border of scapula

72
Q

ACTION of the serratus anterior

A

scapular abduction, holds scapula against thoracic wall, works w/ trapezius to rotate scapula upward to allow for full shoulder abduction

73
Q

INNERVATION of the serratus anterior

A

long thoracic nerve

74
Q

ORIGIN of the pectoralis minor

A

ribs 3-5 nearby the costal cartilages

75
Q

INSERTION of the pectoralis minor

A

medial border and superior surface of the coracoid process

76
Q

ACTION of the pectoralis minor

A

scapular protraction, elevation of ribs with inspiration, scapula is fixed by levator scapulae

77
Q

INNERVATION of the pectoralis minor

A

medial and lateral pectoral nerves (c5-t1)

78
Q

what is a shoulder impingement

A

space between the acromion and rotator cuff narrows as the arm gets abducted, acromion can rub against the tendon and bursa, causing inflammation and pain

79
Q

what is biceps tendinitis

A

inflammation of upper biceps tendon, the tendon connects the upper end of the bicep to the shoulder bones.

80
Q

what is rotator cuff tendonitis

A

inflammation of the rotator cuff tendons and bursa (usually smooth lining of the tendons)

81
Q

describe a rotator cuff tear

A

torn tendon fibers, can be an acute tear or a slow, chronic tear (classified by their length and location)

82
Q

what is a trapezius muscle spasm

A

spasm of upper trapezius due to chronic forward posture

83
Q
A

MSA (13 decks)

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