Posterior Shoulder Muscles Flashcards Preview

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Flashcards in Posterior Shoulder Muscles Deck (65)
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1

Trapezius Origin

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

2

Trapezius Insertion

Lateral third of clavicle; acromion and spine of scapula

3

Trapezius Innervation

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

4

Trapezius Action

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

5

Trapezius Roots

C3,C4

6

Latissimus Dorsi Origin

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

7

Latissimus Dorsi Insertion

Floor of intertubercular sulcus of humerus

8

Latissimus Dorsi Innervation

Thoracodorsal nerve (C6, C7, C8)

9

Latissimus Dorsi Action

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

10

Latissimus Dorsi Roots

C6, C7, C8

11

Rhomboid Minor & Major Origin

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

12

Rhomboid Minor & Major Insertion

Minor: smooth triangular area at medial and scapular spine

13

Rhomboid Minor & Major Innervation

Dorsal scapular nerve (C4, C5)

14

Rhomboid Minor & Major Action

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

15

Rhomboid Minor & Major Root

C4, C5

16

Levator Scapulae Origin

Posterior tubercles of transverse processes of C1-C4 vertebrae

17

Levator Scapulae Insertion

Medial border of scapula superior to root of scapular spine

18

Levator Scapulae Innervation

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

19

Levator Scapulae Action

Elevates scapula and tilts its glenoid inferiorly by rotating scapula

20

Serratus Anterior Origin

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

21

Serratus Anterior Insertion

Anterior surface of medial border of scapula

22

Serratus Anterior Innervation

Long thoracic nerve (C5,C6,C7)

23

Serratus Anterior Action

Protracts scapula and holds it against thoracic wall; rotates scapula

24

Serratus Anterior Root

C5,C6,C7

25

Infraspinatus Origin

Infraspinous fossa of scapula

26

Infraspinatus Insertion

Middle facet of greater tubercle of humerus

27

Infraspinatus Innervation

Suprascapular nerve (C5,C6)

28

Infraspinatus Action

Laterally rotates arm; and acts with rotator cuff muscles

29

Infraspinatus Root

C5,C6

30

Teres Minor Origin

Middle part of lateral border of scapula