Question

question 3
mark this question
which muscle of the posterior forearm is responsible for extension and abduction of the wrist?
extensor pollicis brevis
extensor digitorum
extensor carpi ulnaris
extensor carpi radialis longus

Explanation:

• Extensor Pollicis Brevis: Primarily involved in thumb extension, not wrist abduction.
• Extensor Digitorum: Mainly for finger extension, not wrist abduction.
• Extensor Carpi Ulnaris: Responsible for wrist extension and adduction (ulnar deviation), not abduction.
• Extensor Carpi Radialis Longus: This muscle originates from the lateral supracondylar ridge of the humerus and inserts into the base of the second metacarpal. It is specifically known for its role in wrist extension and abduction (radial deviation).

Answer:

Extensor Carpi Radialis Longus