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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
INSERTION of the supraspinatus
superior facet of greater tuberosity of humerus
26
ACTION of the supraspinatus
abducts shoulder joint , stabilizes head of humerus in the glenoid cavity during movements
27
INNERVATION of the supraspinatus
suprascapular nerve
28
ORIGIN of the infraspinatus
medial 2/3 of infraspinatus fossa of scapula
29
INSERTION of the infraspinatus
middle facet of greater tubercle of humerus
30
ACTION of the infraspinatus
lateral rotation of upper limbs at the shoulder
31
INNERVATION of the infraspinatus
suprascapular nerve, same as supraspinatus
32
ACTION of middle deltoid
abduction of shoulder joint by middle fibers, anterior and posterior fibers help stabilize fibers
33
INNERVATION of middle deltoid
axillary nerve (c5-6)
34
ORIGIN of the subscapularis subscapular nerve
subscapular fossa of scapula
35
ACTION of the subscapularis subscapular nerve
medially rotates shoulder joint, stabilizes head of humerus in glenoid cavity during movements
36
ORIGIN of the teres minor
upper 2/3 of dorsal surface of lateral border of scapula
37
ACTION of the teres minor
laterally rotates shoulder joint, stabilizes head of humerus with movements regarding the glenohumeral joint, kinda same as subscapularis subscapular nerve
38
INNERVATION of the teres minor
axillary nerve
39
what are the four rotator cuff muscles
supraspinatus, infraspinatus, subscapularis, teres minor
40
what action do all rotator cuff muscles share
stabilizing during movement, supraspinatus also helps w/ abduction
41
what rotator cuff muscles actually rotate
infraspinatus (external), teres minor (external), subscapularis (internal)
42
elevation uses what muscles (scapular motion)
(upper/descending) trapezius, levator scapulae, rhomboids
43
depression uses what muscles (scapular motion)
(lower/ascending) trapezius
44
adduction/retraction uses what muscles (scapular motion)
(middle/transverse) trapezius, rhomboids
45
abduction/protraction uses what muscles (scapular motion)
serratus anterior, pectoralis minor
46
ORIGIN of the upper trapezius
external occipital protuberance, medial 1/3 superior nuchal line, ligamentum nuchae, c7 spinous process
47
INSERTION of the upper trapezius
lateral 1/3 of clavicle, acromion process
48
ACTION of the upper trapezius
elevation of scapula and shoulder, captial extension, cervical extension, rotation of head to opposite side, upward rotation of scapula
49
INNERVATION of the upper trapezius
cranial nerve
50
ORIGIN of the levator scapulae
transverse processes of c1-4
51
INSERTION of the levator scapulae
superior arch of scapula
52
ACTION of the levator scapulae
assists in rotation, lateral flexes cervical vertebrae, same-side rotation, cervical extension
53
INNERVATION of the levator scapulae
cervical and dorsal scapular nerve
54
ORIGIN of the rhomboids major
spinous processes t2-5
55
INSERTION of the rhomboids major
fibrous attachment to medial scapular border between spine and scapular angle
56
ACTION of the rhomboids major
helps hold scapula (and thus, the upper limb) onto the ribcage
57
INNERVATION of the rhomboids major
dorsal scapular nerve (c4-5)
58
ORIGIN of the rhomboids minor
ligamentum nuchae, spinous process c7 and t1
59
INSERTION of the rhomboids minor
medial border at the root of the spine of the scapula
60
ACTION of the rhomboids minor
retracts the scapula when the trapezius is being contracted
61
INNERVATION of the rhomboids minor
same as rhomb. major, dorsal scapular nerve (c4-5)
62
ORIGIN of the lower trapezius
spinous process of t6-t12
63
INSERTION of the lower trapezius
tubercle at the apex of the spine of the scapula
64
ACTION of the lower trapezius
scapular adduction, depression and upward rotation
65
INNERVATION of the lower trapezius
spinal nerves of c3-4, accessory nerve
66
ORIGIN of the middle trapezius
spinous processes t1-5
67
INSERTION of the middle trapezius
medial margin of acromion, spine of scapula, crest of superior scapular lip
68
ACTION of the middle trapezius
to draw the acromion, clavicle and spine of scapula medially during contraction
69
INNERVATION of the middle trapezius
accessory nerve (CN XI)
70
ORIGIN of the serratus anterior
external surfaces of lateral parts of ribs 1-8
71
INSERTION of the serratus anterior
anterior surface of medial border of scapula
72
ACTION of the serratus anterior
scapular abduction, holds scapula against thoracic wall, works w/ trapezius to rotate scapula upward to allow for full shoulder abduction
73
INNERVATION of the serratus anterior
long thoracic nerve
74
ORIGIN of the pectoralis minor
ribs 3-5 nearby the costal cartilages
75
INSERTION of the pectoralis minor
medial border and superior surface of the coracoid process
76
ACTION of the pectoralis minor
scapular protraction, elevation of ribs with inspiration, scapula is fixed by levator scapulae
77
INNERVATION of the pectoralis minor
medial and lateral pectoral nerves (c5-t1)
78
what is a shoulder impingement
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
what is biceps tendinitis
inflammation of upper biceps tendon, the tendon connects the upper end of the bicep to the shoulder bones.
80
what is rotator cuff tendonitis
inflammation of the rotator cuff tendons and bursa (usually smooth lining of the tendons)
81
describe a rotator cuff tear
torn tendon fibers, can be an acute tear or a slow, chronic tear (classified by their length and location)
82
what is a trapezius muscle spasm
spasm of upper trapezius due to chronic forward posture
83

MSA (13 decks)

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