3. Rotator cuff muscles Flashcards Preview

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Flashcards in 3. Rotator cuff muscles Deck (27)
1

Rotator cuff muscles ?

shoulder cuff muscles that form the rotator cuff

2

rotator cuff muscles - muscles ?

1. supraspinatus
2. infraspinatus
3. teres minor
4. subscapularis

3

rotator cuff muscles are innervated primary by

C5-C6

4

supraspinatus muscle is innervated by

suprascapular nerve

5

supraspinatus muscle - function

-abducts arm initially ( before the action of deltoid)
- laterally rotates arm

6

infraspinatus muscle innervated by

suptrscapular nerve

7

infraspinatus muscle - function

laterally roates arm

8

teres minor is innervated by

axillary nerve

9

teres minor - function

adducts and laterally roates arm

10

subscapularis is innervated by

upper and lower subscapsular nerve

11

subscapularis muscle - function

medeally rotates and adducts arm

12

subscapsularis is ineerbated by

upper and lower subscapular nerve

13

subscapularis muscle - function

medeally rotates and adducts arm

14

most common rotator cuff muscle inhury and explain

supraspinatus muscle -- trauma or degeneration and impingement --> tenidndopathy or tera

15

supreaspinatus muscle injury is assessed by

empty full / can test

16

empty full / can test - process

the patient is testd at 90o elevation in the scapula pane and full internal rotation ( empty can ) or 45o external rotation ( gull can). Patient resists doward pressure exerted by examiner at patients elbow or wrist

17

empty full / can test to assess

supraspinatus muscle injury

18

infraspinatus injury -->

pitching injury

19

• A patient abducts his arm. Which two muscles help him to do so, and how do they cooperate?

The supraspinatus initially abducts the arm, before the action of the deltoid

20

• What is the action of the teres minor? Which nerve innervates this muscle?

Adducts and laterally rotates the arm; axillary nerve

21

• Which rotator cuff muscle adducts and medially rotates the arm? Which nerve(s) innervate(s) this muscle?

Subscapularis; upper and lower subscapular nerves

22

• Which muscle of the rotator cuff is found on the superior aspect of the humerus? Which nerve innervates this muscle?

Supraspinatus; suprascapular nerve

23

• You suspect your 18-year-old patient has injured his rotator cuff in the most common way. What test can help confirm this injury?

The empty-can/full-can test, which suggests supraspinatus injury

24

• A patient who cannot move his shoulder after a traumatic accident has likely injured nerves at what spinal levels?

C5–C6

25

• A patient has a positive empty-can test. The deltoid muscle functions normally. An injury to which nerve may be to blame?

The suprascapular nerve, which innervates the supraspinatus muscle (assessed with the empty-/full-can test

26

• What muscles comprise the rotator cuff?

Supraspinatus, Infraspinatus, teres minor, Subscapularis (SItS, where small t is for teres minor)

27

• A pitcher presents with shoulder pain. What nerve innervates the muscle that is most likely to be injured in this particular patient?

The suprascapular nerve (innervates the infraspinatus muscle, which is commonly injured in pitchers)

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