Shoulder Myology

Question 1

Deltoid m.

Answer 1

I: Deltoid tuberosity of humerus
A:
Clavicular part: Flex and medially rotate humerus
Acromial part: ABduct humerus
Spinal pat: Extend and laterally rotate humerus

N: Axillary n.

Blood Supply: Posterior humeral circumflex a.

Question 2

Subscapularis m.

Answer 2

I: Lesser tubercle of humerus
A: Medially rotate and ADduct humerus
N: Superior subscapular n., inferior subscapular n.
Blood Supply: Subscapular a.

Question 3

Supraspinatus m.

Answer 3

I: Greater humeral tubercle
A: ABduct humerus ; hold humeral head in glenoid cavity
N: Suprascapular n.
Blood Supply: Superscapular a.

Question 4

Infraspinatus m.

Answer 4

I: Greater humeral tubercle
A: Laterally, ER humerus
N: Suprascapular n.
Blood Supply: Superscapular artery

Question 5

Teres minor m.

Answer 5

I: Greater humeral tubercle

A: ER humerus
IR humerus/ ADduct humerus

N: inferior Axillary n.

Blood Supply: Circumflex scapular a.

Question 6

Teres major m.

Answer 6

I: Medial edge intertubicular groove of humerus
A: IR humerus, ADduct humerus
N: Inferior subscapular n.
Blood Supply: Circumflex scapular a.