Extensor pollicis brevis muscle

This video tutorial covers the extensor pollicis brevis muscle, one of the deep extensors of the forearm. It details the muscle's origin, insertion, and innervation by the radial nerve. The anatomical snuffbox, framed by the radius and tendons, is highlighted. The video explains the functions of deep extensors in hand and thumb movement, emphasizing the extensor pollicis brevis's role in thumb extension and abduction. The tutorial concludes by promoting Ken Hub as a resource for further anatomy learning.

Which muscle lies on the medial side of the abductor pollicis longus?

• Abductor pollicis brevis

• Flexor pollicis longus

• Extensor pollicis longus

• Extensor pollicis brevis

Where does the extensor pollicis brevis originate?

• Medial side of the humerus

• Posterior side of the radius

• Anterior side of the ulna

• Lateral side of the scapula

What is the role of the posterior interosseous nerve?

• Innervates the superficial flexors

• Innervates the deep extensors

• Controls the biceps brachii

• Supplies the deltoid muscle

What is the anatomical snuffbox also known as?

• Radial fossa

• Carpal tunnel

• Cubital fossa

• Ulnar groove

What is the primary function of the extensor pollicis brevis?

• Flexes the thumb

• Adducts the thumb

• Extends and abducts the thumb

• Rotates the thumb