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S1 Anatomy > Shoulder Muscles > Flashcards

Shoulder Muscles Flashcards

1
Q

pec major

-origin

A 
clavicular head
-anterior surface of sternal 1/2 of clavicle
sternocostal head
-anterior surface of sternum
-adjacent superior 6 costal cartilages
-aponeurosis of external oblique
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2
Q

pec major

-insertion

A

common tendon to lateral lip of intertubercular groove

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3
Q

pec major

-action

A 
both heads
-adducts and internally rotates humerus
clavicular head
-flexes humerus
sternocostal head
-extends humerus
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4
Q

pec major

-innervation

A 
clavicular head
-lateral pectoral nerve (C5, C6)
sternocostal head
-medial pectoral nerve (C7-T1)
-C7 comes from communicating branch off lateral pectoral nerve
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5
Q

pectoralis minor

-orign

A

ribs 3-5 near their costal cartilages

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6
Q

pectoralis minor

-insertion

A

medial border and superior surface of coracoid process or scapula

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7
Q

pectoralis minor

-actions

A

stabilized scapula by pulling it anteriorly and inferiorly against thoracic wall
protraction (minor) by moving scapula laterally and anteriorly around thoracic cage

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8
Q

pectoralis minor

-innervation

A

medial pectoral nerve (C8, T1)

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9
Q

subclavius

-origin

A

junction of rib 1 and its costal cartilage

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10
Q

subclavius

-insertion

A

inferior surface of middle 1/3 of clavicle

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11
Q

subclavius

-action

A

draws clavicle medially

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12
Q

subclavius

-innervation

A

nerve to subclavius (C5, C6)

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13
Q

serratus anterior

-origin

A

external surfaces of lateral parts of ribs 1-8

fascia overlying external intercostal muscles

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14
Q

serratus anterior

-insertion

A

anterior surface of medial border of scapula

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15
Q

serratus anterior

-action

A 
protracts scapula and holds it against thoracic wall (along with subclavius)
rotates scapula (pulls on inferior angle of scapula; assists trapezius)
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16
Q

serratus anterior

-innervation

A

long thoracic nerve (C5-C7)

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17
Q

what are the pectoral muscles

A

pec major
pec minor
subclavius
serratus anterior

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18
Q

what are the extrinsic muscles of the back?

A

trapezius
latissimus dorsi
levator scapulae
rhomboid major/minor

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19
Q

trapezius

-origin

A 
medial 1/3 of superior nuchal line
external occipital protuberance
ligamentum nuchae
spinous processes of C7-T12
lumbar and sacral spinous processes via pulling on thoracolumbar fascia
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20
Q

trapezius

-insertion

A

lateral 1/3 of clavicle
acromion and spine of scapula
superior fibers extend more laterally, while inferior fibers insert on the spine as an aponeurosis, withous extending out to the acromion

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21
Q

trapezius

-actions

A 
superior fibers
-elevate
middle fibers
-retract
inferior fibers
-depress
superior and inferior fibers together
-superiorly rotate lateral angle (assisted by serratus anterior)
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22
Q

trapezius

-innervation

A

spinal accessory nerve (CN XI)

ventral rami of cervical nerves C3, C4 (primarily sensory for proprioceptive and pain sensation)

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23
Q

latissimus dorsi

-origin

A

spinous process of the inferior 6 thoracic vertebrae
thoracolumbar fascia
iliac crest
inferior 3-4 ribs (9-12)

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24
Q

latissimus dorsi

-insertion

A

floor of intertubercular groove of humerus

25
Q

latissimus dorsi

-actions

A

humerus extension
humerus adduction
humerus internal rotation
raises body towards arms during climbing

26
Q

latissimus dorsi

-innervation

A

thoracodorsal nerve (C6-C8)

27
Q

levator scapulae

-origin

A

posterior tubercles of transverse process of C1-C4 vertebrae

28
Q

levator scapulae

-insertion

A

superior part of medial border of scapula

29
Q

levator scapulae

-action

A

elevates scapula

inferiorly rotates lateral angle of scapula

30
Q

levator scapulae

-innervation

A 
dorsal scapular nerve (C5)
cervical nerve (C3, C4)
31
Q

rhomboid minor/major

-origin

A 
minor
-ligamentum nuchae
-spinous process of C7, T1
major
-spinous processes of T2-T5
32
Q

rhomboid minor/major

-insertion

A

medial border of scapula from level of spine of scapula to inferior angle

33
Q

rhomboid minor/major

-actions

A

retracts scapula
inferiorly rotates lateral angle, depressing glenoid cavity
fixes scapula to thoracic wall

34
Q

rhomboid minor/major

-innervation

A

dorsal scapular nerve (C4, C5)

35
Q

what are the scapular muscles (scapulohumeral muscles)

A 
deltoid
supraspinatus
infraspinatus
teres minor
teres major
subscapularis
36
Q

deltoid

-origin

A

lateral 1/3 of clavicle
acromion
spine of scapula

37
Q

deltoid

-insertion

A

deltoid tuberosity of humerus

38
Q

deltoid

-actions

A 
anterior part
-arm flexion
-arm medial rotation
middle part
-arm abduction
posterior part
-extends arm
-laterally rotates arm
39
Q

deltoid

-innervation

A

axillary nerve (C5, C6)

40
Q

supraspinatus

-origin

A

supraspinous fossa of scapula

41
Q

supraspinatus

-insertion

A

superior facet of greater tubercle of humerus

42
Q

supraspinatus

-action

A

abducts arm (assists deltoid)

43
Q

supraspinatus

-innervation

A

suprascapular nerve (C4-C6)

44
Q

infraspinatus

-origin

A

infraspinous fossa of scapula

45
Q

infraspinatus

-insertion

A

middle facet on greater tubercle of humerus

46
Q

infraspinatus

-action

A

arm external rotation

helps hold head of humerus in glenoid cavity (as rotator cuff muscle)

47
Q

infraspinatus

-innervation

A

suprascapular nerve (C5, C6)

48
Q

teres minor

-origin

A

superior part of lateral border of scapula

49
Q

teres minor

-insertion

A

inferior facet on greater tubercle of humerus

50
Q

teres minor

-action

A

arm external rotation

helps hold head of humerus in glenoid cavity

51
Q

teres minor

-innervation

A

axillary nerve (C5, C6)

52
Q

teres major

-origin

A

dorsal surface of inferior angle of scapula

53
Q

teres major

-insertion

A

medial lip of intertubercular groove of humerus

54
Q

teres major

-action

A

arm adduction

arm internal rotation

55
Q

teres major

-innervation

A

lower subscapular nerve (C5, C6)

56
Q

subscapularis

-origin

A

subscapular fossa

57
Q

subscapularis

-insertion

A

lesser tubercle of humerus

58
Q

subscapularis

-action

A

arm internal rotation
arm adduction
helps hold head of humerus in glenoid cavity

59
Q

subscapularis

-innervation

A

upper and lower subscapular nerve (C5-C7)

S1 Anatomy (31 decks)

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