What is the definition or description of: median nerve entrapment?

Carpal tunnel: Most commonly this refers to carpal tunnel syndrome where the median nerve is impinged upon in the wrist/lower hand area by the overlying fibrous band pressing it down onto the carpal bones.

Carpal tunnel syndr,: Most common presentation with mechanical compression of median nerve at wrist causing hand numbness, tingling, pain, and weakness. Nerve can be compressed at edge of flexor carpi radials (pronator syndrome), and rarely over volar forearm, affecting pronator quadratis and flexor carpi profundus.