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Anatomy Exam 3 > Shoulder > Flashcards

Flashcards in Shoulder Deck (50)
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1

What are the muscles of the pectoral region, where do they originate?

pectoralis major, pectoralis minor, serratus anterior

they originate on the anterior aspect of the axial skeleton

2

What innervate the muscles of the pectoral region?

C6-C8

3

Where does pectoralis major insert?

onto the proximal humeral shaft

4

Innervation of pectoralis major

medial and lateral pectoral nn.

5

Actions of pectoralis major

adduction, flexion and medial rotation of GHJ

6

Attachments of pectoralis minor

origin: ribs 3-5

insertion: coracoid process of the scapula

7

Actions of pectoralis minor

protraction of and depression of the scapula

8

What innervates pectoralis minor?

medial pectoral n. (medial does more)

9

Attachments of serratus anterior

origin: lateral aspect of ribs 1-8

insertion: anterior surface of medial border of scapula

10

Actions of serratus anterior

protraction and upward rotation of scapula, fixes scapula on thoracic wall

11

Innervation of serratus anterior

long thoracic n.

12

What will occur if there is injury to the long thoracic nerve?

pt will have winged scapula because serratus anterior will not be able to hold the scapula against the thoracic wall

13

What supplies blood to the pectoral region?

Axillary artery, gives off thoracoacromial a. and lateral thoracic a.

14

thoracoacromial artery

supplies pectoral muscles and deltoid

15

lateral thoracic artery

supplies serratus anterior and pectoral muscles

16

What are the extrinsic muscles of the back?

trapezius, levator scapulae, rhomboid minor/major, latissimus dorsi

17

What innervates the extrinsic muscles of the back?

C5-7

CN XI

18

Actions of trapezius?

superior fibers: elevation

middle fibers: retraction

inferior fibers: depression

superior + inferior: upward rotation

19

innervation of trapezius?

cranial nerve XI

can be tested by asking pt to shrug shoulders against resistance

20

Attachments of levator scapulae

origin: cervical transverse process

insertion: superior angle of scapula

21

Actions of levator scapulae

elevate and downward rotation of scapula

22

innervation of levator scapulae

dorsal scapular n.

23

attachments of rhomboid minor and major

origin: nuchal ligament and thoracic spinous process

insertion: medial border of scapula

24

Actions of rhomboid minor and major:

retraction and downward rotation (fixes scapula on body wall)

25

Innervation of rhomboid minor and major

dorsal scapular n.

26

attachments of latissimus dorsi

origin: thoracolumbar fascia, iliac crest, ribs

insertion: anteromedial aspect of proximal humerus

27

actions of latissimus dorsi

extension, adduction and medial rotation of GH joint

28

Innervation of latissimus dorsi

thoracodorsal n.

29

What are the intrinsic muscles of the shoulder?

deltoid

teres major

rotator cuff muscles: supraspinatous, infraspinatous, teres minor, subscapularis

originate on scapula, insert on humerus

30

What innervates the intrinsic muscles of the shoulder?

C5-C6