Palmar Interosseus mm

The 3 palmar interossei mm. originate from the sides of metacarpals 2, 4, and 5, and insert into the base of the proximal phalanges of digits 2, 4, and 5.  The palmar interossei adduct (PAD) digits 2, 4, and 5 toward digit 3.  All of the interossei are innervated by the ulnar n.