Question

identify the posterior superficial muscle labeled b. flexor carpi ulnaris extensor pollicis longus extensor digitorum extensor carpi ulnaris extensor carpi radialis longus

Explanation:

The extensor digitorum is a posterior superficial muscle in the forearm. It is responsible for extending the fingers. The flexor carpi ulnaris is a flexor (not extensor) and located on the anterior side. The extensor pollicis longus has a more specific role in thumb extension and a different location. The extensor carpi ulnaris is more towards the ulnar (pinkie - side) edge. The extensor carpi radialis longus is more radial (thumb - side) and has a role in wrist extension towards the radial side. Based on the typical anatomical position and function related to the labeled area (as a major finger - extending muscle in the posterior superficial layer), the extensor digitorum is the correct identification.

Answer:

Extensor digitorum