Musculus supinator

The video tutorial discusses the supinator muscle, one of the five deep extensors of the forearm. It covers the muscle's origin, insertion, innervation, and function. The supinator muscle originates from the lateral epicondyle of the humerus and the ulna, and it inserts on the radius. It is innervated by the radial nerve and is responsible for supination of the forearm. Unlike other extensors, its primary function is not finger or hand extension but rotation of the radius outward.

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

• Supinator muscle

• Abductor pollicis longus

• Flexor carpi radialis

• Extensor pollicis brevis

Where does the supinator muscle originate?

• Radial tuberosity

• Epicondyle, lateralis, humeri

• Medial epicondyle of the humerus

• Olecranon process

The supinator muscle inserts between which two anatomical landmarks?

• Ulnar notch and radial styloid process

• Coronoid process and radial head

• Radial tuberosity and pronator teres attachment

• Medial epicondyle and olecranon

Which nerve is responsible for the innervation of the supinator muscle?

• Musculocutaneous nerve

• Ulnar nerve

• Median nerve

• Radial nerve

What is the primary function of the supinator muscle?

• Flexion of the wrist

• Pronation of the forearm

• Extension of the fingers

• Supination of the forearm