Lab 3: Scapula & Shoulder

Question 1

Deltoid

Answer 1

Abducts arm 15-90 degrees. Inserts into deltoid tuberosity of humerus. Innervation: axillary nerve (C5, 6)

Question 2

Rotator Cuff Muscles

Answer 2

SITS: Supraspinatus (initiates humeral abduction), Infraspinatus, Teres minor, Subscapularis

Question 3

Triangular Space

Answer 3

Bound by teres major and minor, long head of triceps brachii. Traversed by circumflex scapular artery

Question 4

Quadrangular Space

Answer 4

Bound by teres major & minor, triceps brachii and surgical neck of humerus. Traversed by axillary nerve and posterior circumflex humeral artery

Question 5

Supraspinatus

Answer 5

Abducts arm first 15 degrees

Question 6

Trapezius & serratus anterior

Answer 6

Abducts above 90 degrees

Question 7

Shoulder anastomosis

Answer 7

Supplies muscles of posterior scapular area. Consist of dorsal scapular artery, suprascapular artery, circumflex scapular artery