Abductor pollicis longus muscle

This tutorial focuses on the abductor pollicis longus, a deep extensor muscle of the forearm. It covers the muscle's origin at the dorsal surfaces of the radius and ulna, its insertion at the base of the first metacarpal bone, and its additional attachment to the trapezium. The muscle is innervated by the radial nerve, specifically the posterior interosseous nerve. The abductor pollicis longus is responsible for thumb abduction and radial deviation at the wrist joint. The video concludes with a call to explore more anatomy resources on Kenhub.

What are the origins of the abductor pollicis longus muscle?

Describe the insertion point of the abductor pollicis longus muscle.

What nerve innervates the deep extensors of the forearm?

What is the main function of the deep extensors of the forearm?

Explain how the abductor pollicis longus contributes to thumb movement.