Intrinsic muscles of the shoulder Flashcards Preview

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Flashcards in Intrinsic muscles of the shoulder Deck (27):
1

Origin of deltoid

Scapula and clavicle

2

Attachment of deltoid

Deltoid tuberosity on lateral humerus

3

What are the intrinsic muscles of the shoulder

Deltoid,
Teres major,
Rotator cuff muscles (supraspinatus, infraspinatus, subscapularis, teres minor)

4

Actions of deltoid

Anterior fibres flex arm at shoulder,
Middle fibres abduct arm at shoulder (15-90)
Posterior fibres extend arm at shoulder

5

Innervation of deltoid

Axillary nerve

6

Origin of teres major

Posterior surface of inferior angle of scapula

7

Attachment of teres major

Intertubercular groove of humerus

8

Action of teres major

Adduction and medial rotation of arm at shoulder

9

Innervation of teres major

Lower subscapular nerve

10

Origin of supraspinatus

Supraspinatous fossa of scapula

11

Attachment of supraspinatus

Greater tubercle of humerus

12

Innervation of supraspinatus

Suprascapular nerve

13

Action of supraspinatus

Abduction 0-15 and assists deltoid for 15-90

14

Origin of infraspinatus

Infraspinatous fossa of scapula

15

Attachment of infraspinatus

Greater tubercle of humerus

16

Innervation of infraspinatus

Suprascapular nerve

17

Action of infraspinatus

Lateral rotation of arm

18

Origin of subscapularis

Subscapular fossa on costal surface of scapula

19

Attachment of subscapularis

Lesser tubercle of humerus

20

Innervation of subscapularis

Upper and lower subscapular nerves

21

Action of subscapularis

Medial rotation of arm

22

Origin of teres minor

Posterior surface of scapula adjacent to its lateral border

23

Attachment of teres minor

Greater tubercle of humerus

24

Innervation of teres minor

Axillary nerve

25

Action of teres minor

Lateral rotation of arm

26

What is rotator cuff tendinitis

Inflammation of tendons of rotator cuff muscles (supraspinatus tendon and subacromial bursa), usually secondary to repetitive shoulder use.
During abduction of arm, the supraspinatus muscle rubs against the coracoacromial arch

27

Treatment of rotator cuff tendinitis

Rest, analgesia and physiotherapy
More severe cases require steroid injections and surgery

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