Anatomy Dissection 9 Flashcards Preview

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Flashcards in Anatomy Dissection 9 Deck (20):
1

What role does the posterior (spinal) part of deltoid have?

Extension at shoulder

2

What role does the middle (acromial) part of deltoid have?

Abduction at shoulder (taking over from supraspinatus beyond 15 degrees)

3

What role does the anterior (calvicular) part of deltoid have?

Mainly flexion at shoulder

4

What does the ascending, middle and descending parts of trapezius do?

Ascending - scapular depression
Middle - retraction
Descending - Elevation

5

What parts of trapezius contract together to produce superior rotation of glenoid fossa?

Ascending and descending

6

What muscle involved in the shoulder does elevation of scapula and inferior rotation of glenoid fossa?

Levator scapulae

7

What two muscles are involved in retraction of scapula and inferior rotation of glenoid fossa?

Rhomboid major and minor

8

Name the four rotator cuff (SITS) muscles?

1. Supraspinatus
2. Infraspinatus
3. Teres minor
4. Subscapularis

9

What SITS muscle does the first 15 degrees abduction at shoulder?

Spuraspinatus

10

What SITS muscles stabilises head of humerus in glenoid/lateral rotation at shoulder?

Infraspinatus and teres minor

11

What SITS muscle stabilises head of humerus in glenoid/medial rotation at shoulder

Subscapularis

12

Name the clinically important group of muscles which attach between the scapula proximally and the tubercles of head of humerus distally?

Rotator cuff muscles

13

What rotator cuff muscles medially rotates the humerus at shoulder joint?

Subscapularis

14

What rotator cuff muscle laterally rotates humerus at shoulder joint?

Infraspinatus and teres minor

15

What rotator cuff muscle initiates abduction first 15 degrees of humerus before the middle fibrers of deltoid take oveR?

Supraspinatus

16

What do supraspinatus, infraspinatus and teres minor all distally insert to?

Greater tubercle humerus

17

What does subscapularisw distally insert to?

Lesser tubercle of humerus

18

What innervates the rotator cuff muscles?

Branches from brachial plexus

19

Impingement of what between the humerus and acromion process can lead to painful arc syndrome?

Supraspinatus tendon

20

What degrees is painful arc syndrome felt?

50-130 degrees