15.POSTERIOR INTEROSSEOUS NERVE IS CONTINUATION OF

A.COMMON INTEROSSEOUS NERVE

B.DEEP BRANCH OF RADIAL NERVE

C.DEEP BRANCH OF ULNAR NERVE

D.

ANS:DEEP BRANCH OF RADIAL NERVE

The posterior interosseous nerve (or dorsal interosseous nerve) is a nerve in the forearm. It is the continuation of the deep branch of the radial nerve, after this has crossed the supinator muscle. It is considerably diminished in size compared to the deep branch of the radial nerve. The nerve fibers originate from cervical segments C7 and C8.

Course

It descends on the interosseous membrane, in front of the Extensor pollicis longus, to the back of the carpus, where it presents a gangliform enlargement from which filaments are distributed to the ligaments and articulations of the carpus.