Supinator muscle

This tutorial covers the supinator muscle, a deep extensor of the forearm. It details the anatomy, origin, and insertion of the supinator, as well as its innervation by the radial nerve. The video explains how the supinator differs from other deep extensors, focusing on its role in supination at the radial ulnar joint. Additional resources for further learning are provided.

Which of the following is NOT one of the deep extensors of the forearm?

• Abductor pollicis longus

• Supinator muscle

• Flexor carpi radialis

• Extensor pollicis brevis

Where does the supinator muscle originate from?

• Lateral epicondyle of the humerus

• Medial epicondyle of the humerus

• Radial tuberosity

• Ulnar collateral ligament

Which nerve is responsible for innervating the deep extensors of the forearm?

• Radial nerve

• Median nerve

• Musculocutaneous nerve

• Ulnar nerve

What is the primary function of the supinator muscle?

• Flexion of the wrist

• Extension of the fingers

• Pronation of the forearm

• Supination of the forearm

How does the supinator muscle differ from other deep extensors?

• It directly receives motor supply from the radial nerve

• It primarily flexes the wrist

• It is located on the anterior side of the forearm

• It is innervated by the ulnar nerve