Triceps Brachii

Question 1

What is the origin of the long head of the triceps brachii?

Answer 1

Infraglenoid tubercle of the scapula.

Question 2

What is the origin of the lateral head of the triceps brachii?

Answer 2

Posterior surface of humerus, superior to the radial groove.

Question 3

What is the origin of the medial head of the triceps brachii?

Answer 3

Posterior surface of humerus, inferior to the radial groove.

Question 4

Where does the triceps brachii insert?

Answer 4

Upper surface of the olecranon process of the ulna.

Question 5

Which nerve supplies the triceps brachii?

Answer 5

Radial nerve (C6–C8).

Question 6

What is the main action of the triceps brachii?

Answer 6

Extension of the forearm at the elbow joint.

Question 7

Which head of triceps crosses the shoulder joint?

Answer 7

Long head.

Question 8

Which head of the triceps is active during all types of extension?

Answer 8

Medial head.

Question 9

What is the function of the long head of the triceps at the shoulder joint?

Answer 9

Helps with shoulder extension and stabilizes the humeral head.