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pt gross > Posterior Shoulder Muscles > Flashcards

Posterior Shoulder Muscles Flashcards

1
Q

Trapezius Origin

A

Medial third of superior nuchal line; external occipital protuberance; nuchal ligament; spinous processes of C7-T12 vertebrae

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2
Q

Trapezius Insertion

A

Lateral third of clavicle; acromion and spine of scapula

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3
Q

Trapezius Innervation

A

Spinal accessory nerve (CN XI) (motor fibers) and C3, C4 spinal nerves (pain and proprioceptive fibers)

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4
Q

Trapezius Action

A

Descending part elevates; ascending part depresses; and middle part(or all parts together) retracts scapula; descending and ascending parts act together to rotate glenoid cavity superiorly

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5
Q

Trapezius Roots

A

C3,C4

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6
Q

Latissimus Dorsi Origin

A

Spinous processes of the inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs

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7
Q

Latissimus Dorsi Insertion

A

Floor of intertubercular sulcus of humerus

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8
Q

Latissimus Dorsi Innervation

A

Thoracodorsal nerve (C6, C7, C8)

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9
Q

Latissimus Dorsi Action

A

Extends, adducts, and medially rotates humerus; raises body toward arms during climbing

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10
Q

Latissimus Dorsi Roots

A

C6, C7, C8

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11
Q

Rhomboid Minor & Major Origin

A

Minor: nuchal ligament; spinous processes of C7 and T1 vertebrae

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12
Q

Rhomboid Minor & Major Insertion

A

Minor: smooth triangular area at medial and scapular spine

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13
Q

Rhomboid Minor & Major Innervation

A

Dorsal scapular nerve (C4, C5)

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14
Q

Rhomboid Minor & Major Action

A

Retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall

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15
Q

Rhomboid Minor & Major Root

A

C4, C5

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16
Q

Levator Scapulae Origin

A

Posterior tubercles of transverse processes of C1-C4 vertebrae

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17
Q

Levator Scapulae Insertion

A

Medial border of scapula superior to root of scapular spine

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18
Q

Levator Scapulae Innervation

A

Dorsal scapular (C5) and cervical (C3, C4) nerves

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19
Q

Levator Scapulae Action

A

Elevates scapula and tilts its glenoid inferiorly by rotating scapula

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20
Q

Serratus Anterior Origin

A

External surfaces of lateral parts of 1st-8th ribs

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21
Q

Serratus Anterior Insertion

A

Anterior surface of medial border of scapula

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22
Q

Serratus Anterior Innervation

A

Long thoracic nerve (C5,C6,C7)

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23
Q

Serratus Anterior Action

A

Protracts scapula and holds it against thoracic wall; rotates scapula

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24
Q

Serratus Anterior Root

A

C5,C6,C7

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25
Q

Infraspinatus Origin

A

Infraspinous fossa of scapula

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26
Q

Infraspinatus Insertion

A

Middle facet of greater tubercle of humerus

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27
Q

Infraspinatus Innervation

A

Suprascapular nerve (C5,C6)

28
Q

Infraspinatus Action

A

Laterally rotates arm; and acts with rotator cuff muscles

29
Q

Infraspinatus Root

30
Q

Teres Minor Origin

A

Middle part of lateral border of scapula

31
Q

Teres Minor Insertion

A

Inferior facet of greater tubercle of humerus

32
Q

Teres Minor Innervation

A

Axillary nerve (C5,C6)

33
Q

Teres Minor Action

A

Laterally rotates arm; and acts with rotator cuff muscles

34
Q

Teres Minor Root

35
Q

Teres Major Origin

A

Posterior surface of inferior angle of scapula

36
Q

Teres Major Insertion

A

Medial lip of intertubercular sulcus of humerus

37
Q

Teres Major Innervation

A

Lower subscapular nerve (C5,C6)

38
Q

Teres Major Action

A

Adducts and medially rotates arm

39
Q

Teres Major Root

40
Q

Subscapularis Origin

A

Subscapular fossa (most of anterior surface of scapula)

41
Q

Subscapularis Insertion

A

Lesser tubercle of humerus

42
Q

Subscapularis Innervation

A

Upper and lower subscapular nerves (C5,C6,C7)

43
Q

Subscapularis Action

A

Medially rotates arm; as part of rotator cuff, helps hold head of humerus in glenoid cavity

44
Q

Subscapularis Root

45
Q

Omohyoid Origin

A

Superior border od scapula near suprascapular notch

46
Q

Omohyoid Insertion

A

Inferior border of hyoid

47
Q

Omohyoid Innervation

A

C1-C3 by a branch of ansa cervicalis

48
Q

Omohyoid Action

A

Depresses, retracts, and steadies hyoid

49
Q

Omohyoid Root

50
Q

Deltoid Anterior (Clavicular) Origin

A

Lateral third of the clavicle

51
Q

Deltoid Anterior (Clavicular) Insertion

A

Deltoid tuberosity of humerus

52
Q

Deltoid Anterior (Clavicular) Innervation

A

Axillary nerve

53
Q

Deltoid Anterior (Clavicular) Action

A

Flexion, medial (internal) rotation and abduction of arm

54
Q

Deltoid Middle (Acromial) Origin

A

Acromion of scapula

55
Q

Deltoid Middle (Acromial) Insertion

A

Deltoid tuberosity

56
Q

Deltoid Middle (Acromial) Innervation

A

Axillary nerve

57
Q

Deltoid Middle (Acromial) Action

A

Abduction of arm

58
Q

Deltoid Posterior (Spinal) Origin

A

Spine of the scapula

59
Q

Deltoid Posterior (Spinal) Insertion

A

Deltoid tuberosity

60
Q

Deltoid Posterior (Spinal) Innervation

A

Axillary nerve

61
Q

Deltoid Posterior (Spinal) Action

A

Extension, lateral, (external) rotation and abduction of arm

62
Q

Supraspinatus Origin

A

Supraspinous fossa of scapula

63
Q

Supraspinatus Insertion

A

Anterior facet of greater tubercle of humerus

64
Q

Supraspinatus Innervation

A

Suprascapular nerve

65
Q

Supraspinatus Action

A

Stabilize humeral head in glenoid fossa; initial abduction of humerus to ~ 15 degrees

pt gross (17 decks)

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