Musculus extensor pollicis brevis

The video tutorial explains the Musculus Extensor Pollicis Brevis, a muscle located in the forearm responsible for extending the thumb. It details the muscle's origin, insertion, and innervation by the radial nerve. The tutorial also covers the anatomical features of the hand, including the tabatiere, and describes the muscle's role in thumb movement, specifically in the carpo-metacarpal and metacarpophalangeal joints.

Where is the extensor pollicis brevis muscle located?

• At the front of the forearm

• At the back of the forearm

• In the palm of the hand

• In the upper arm

Which membrane is associated with the origin of the extensor pollicis brevis?

• Membrana Articularis

• Membrana Fibrosa

• Membrana Synovialis

• Membrana Interossea

What is the deep branch of the radial nerve called?

• Ramus Superficialis

• Ramus Lateralis

• Ramus Medialis

• Ramus Profundus

What is the primary function of the extensor pollicis brevis muscle?

• Flexion of the thumb

• Extension of the thumb

• Rotation of the thumb

• Adduction of the thumb

Which joint is primarily affected by the extensor pollicis brevis during thumb movement?

• Elbow joint

• Wrist joint

• Second metacarpophalangeal joint

• First carpometacarpal joint