palmar interosseous muscle


n.

Any of three muscles, the first with its origin from the second metacarpal, and the second and the third with origin from the fourth and fifth metacarpals; the first with insertion into the index finger, and the second and the third with insertion into the ring and little fingers; with nerve supply from the ulnar nerve, and whose action adducts the fingers toward the axis of the middle finger.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.