SITS - Rotator Cuff Muscles

Question 1

Supraspinatus

Answer 1

PA:
+ supraspinous fossa of scapula

DA:
+ superior facet of the greater tubercle of the humerus

N:
+ suprascapular nerve (C4, C5*, C6)

A:
+ initiates and assists deltoid in shoulder abduction, acts with other rotator cuffs

Question 2

Infraspinatus

Answer 2

PA:
+ infraspinous fossa of scapula

DA:
+ middle facet of greater tubercle of the humerus

N:
+ suprascapular nerve (C5*, C6)

A:
+ laterally rotate shoulder joint
+ helps hold humeral head in glenoid cavity of the scapula

Question 3

Subscapularis

Answer 3

PA:
+ subscapular fossa (most of anterior surface of scapula)

DA:
+ lesser tubercle of the humerus

N:
+ upper and lower subscapular nerves (C5, C6*, C7)

A:
+ medially rotates the shoulder joint
+ adducts the shoulder joint
+ helps hold humeral head in glenoid cavity

Question 4

Teres minor

Answer 4

PA:
+ middle part of lateral border of scapula

DA:
+ inferior facet of greater tubercle of the humerus

N:
+ axillary nerve (C5*, C6)

A:
+ laterally rotate shoulder joint
+ helps hold humeral head in glenoid cavity of the scapula