Unit 2 - Upper Limb: Posterior Arm Muscles (Ex. II)

Question 1

medial head of triceps brachii

Answer 1

O: P humerus I to radial groove; M intermuscular septum
I: olecranon of ulna
Inn: radial N (C6-C8)
A: elbow extension

Question 2

lateral head of triceps brachii

Answer 2

O: P humerus proximal to radial groove; L intermuscular septum
I: olecranon of ulna
Inn: radial N (C6-C8)
A: elbow extenison

Question 3

long head of triceps brachii

Answer 3

O: infraglenoid tubercle of scapula
I: olecranon of ulna
Inn: radial N (C6-C8)
A: elbow extension; shoulder extension and adduction

Question 4

anconeus

Answer 4

O: L epicondyle of humerus (variance: P joint capsule)
I: radial surface of olecranon of ulna
Inn: radial N (C6-C8)
A: elbow extension; tightens joint