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Anatomy > Shoulder muscles > Flashcards

Shoulder muscles Flashcards

1
Q

Pectoralis Major origin

A

Medial 1/2 of clavicle, anterior manubrium and body of sternum, costal cartilages of ribs 1-6, rectus sheath

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2
Q

Pectoralis major insertion

A

Lateral lip of bicipital groove

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3
Q

Pectoralis major innervation and spinal level

A

Sternal part: medial pectoral C8 T1

Clavicular part: lateral pectoral C5-7

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4
Q

Pectoralis major action

A

Adduction, horizontal adduction, internal rotation of arm

Assists in flexion, assists in extension from fully flexed position, depress and inferiorly rotate scapula

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5
Q

Pectoralis minor origin

A

Ventral aspects of ribs 3-5

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6
Q

Pectoralis minor insertion

A

Coracoid process of scapula

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7
Q

Pectoralis minor innervation and spinal level

A

Medial pectoral
C8 T1
Maybe some lateral C5,6,7

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8
Q

Pectoralis minor action

A

Depresses and protracts shoulder (stabilizes)

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9
Q

Subclavius location and action

A

Runs superolaterally from 1st rib to clavicle and depresses clavicle and stabilizes

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10
Q

Serratus anterior origin

A

Anterolateral surface of ribs 1-9

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11
Q

Serratus anterior insertion

A

Costal surface of medial border of scapula (@inferior angle mainly)

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12
Q

Serratus anterior innervation and spinal level

A

Long thoracic C5,6,7

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13
Q

Serratus anterior action

A

Protracts scapula, assists upward rotation (lower fibers), depression of scapula, medial rotation(superior fibers)
Maintains contact of vertebral border of scapula to thoracic wall preventing a winging

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14
Q

Trapezius origin

A

External occipital protuberance, ligamentum nuchae, spinous processes C1-T12

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15
Q

Trapezius insertion

A

Spine of scapula, Acromion, lateral 1/3 of clavicle

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16
Q

Trapezius innervation and spinal level

A

Cranial nerve 11 (spinal accessory nerve) C3 C4 Rami

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17
Q

Trapezius action

A

Retract/adduction scapula-most important function is elevation of the lateral angle, or upward rotation of the scapula
Upper fibers: elevate and superiorly rotate scapula , side bend neck
Lower fibers: depress and superiorly rotate scapula
Middle fibers: retract scapula

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18
Q

Rhomboid major origin

A

Spine of T1-4

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19
Q

Rhomboid major insertion

A

Medial border of scapula between spine and inferior angle

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20
Q

Rhomboid major innervation and spinal level

A

Dorsal scapular C5 (C4)

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21
Q

Rhomboid major action

A

Retract/adduct scapula, inferiorly rotate and elevate (medial border) and fix media, border of scapula

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22
Q

Rhomboid minor origin

A

Spinous processes of C6 and C7 (lower part of ligamentum nuchae)

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23
Q

Rhomboid minor insertion

A

Base of spine of the scapula (superior aspect)

24
Q

Rhomboid minor innervation and spinal level

A

Dorsal scapular C5 (C4)

25
Q

Rhomboid minor action

A

Retract/adduct scapula; also inferiorly rotate ,elevate (primarily medial border) and fix medial border of scapula

26
Q

Levator scapulae origin

A

Transverse processes C1-4

27
Q

Levator scapulae insertion

A

Medial border of scapula between superior angle and base of spine

28
Q

Levator scapulae innervation and spinal level

A

May be part of dorsal scapular C3 and C4

29
Q

Levator scapulae action

A

Elevate scapula, may tilt neck to same side if scapula is fixed

30
Q

Latissimus dorsi origin

A

Spinous processes of T7-12, thoracolumbar fascia, posterior 1/3 of iliac crest,lower 4 ribs, inferior angle of scapula

31
Q

Latissimus dorsi insertion

A

Crest of lesser tubercle (floor of bicipital grooves humerus, anterior angle)

32
Q

Latissimus dorsi innervation and spinal level

A

Thoracodorsal C6-8

33
Q

Latissimus dorsi action

A

Adduct, extend, and internally rotate arm- strong depressor and inferior rotator of the shoulder

34
Q

Deltoid origin

A

Lateral 1/3 of clavicle, acromion, and spine of scapula

35
Q

Deltoid insertion

A

Lateral surface of middle humerus (deltoid tuberosity)

36
Q

Deltoid innervation and spinal level

A

Axillary C5,6

37
Q

Deltoid action

A

As a unit: abduct arm
Anterior fibers: flex and internal rotate arm, horizontally adduct arm
Middle fibers: abduct arm
Posterior fibers: extend and externally rotate arm, horizontal abduction

38
Q

Supraspinatus origin

A

Supraspinatus fossa of scapula

39
Q

Supraspinatus insertion

A

Superior facet of greater tubercle of humerus

40
Q

Supraspinatus innervation and spinal level

A

Supracsapular C5,6 (sometimes C4)

41
Q

Supraspinatus action

A 
Abduct arm (before deltoid kicks in) 
Fixes head in humerus (stabilizes)
42
Q

Infraspinatus origin

A

Infraspinatus fossa of scapula

43
Q

Infraspinatus insertion

A

Middle facet of greater tubercle of humerus

44
Q

Infraspinatus innervation and spinal level

A

Suprascapular C5,6 (sometime C4)

45
Q

Infraspinatus action

A

External rotate, assists stabilization of head in humerus

46
Q

Teres minor origin

A

Upper 2/3 of posterior surface of lateral border of scapula

47
Q

Teres minor insertion

A

Lower facet of greater tubercle of humerus

48
Q

Teres minor innervation and spinal level

A

Axillary C5,6

49
Q

Teres minor action

A

Externally rotate arm, assist in adduction

Note: also active on abduction in order to slide/glide humeral head inferiorly

50
Q

Subscapularis origin

A

Subscapular fossa

51
Q

Subscapularis insertion

A

Lesser tubercle of humerus

52
Q

Subscapularis innervation and spinal level

A

Lower and upper subscapular C 5,6

53
Q

Subscapularis action

A

Internally rotate arm, stabilization of the G-H joint

54
Q

Teres major origin

A

Posterior surface of inferior angle of scapula

55
Q

Teres major insertion

A

Medial lip of bicipital groove (crest of lesser tuberosity)

56
Q

Teres major innervation and spinal level

A

Lower subscapular C5,6,7

57
Q

Teres major action

A

Extend (hyper extension) , adduct, internally rotate

Anatomy (8 decks)

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