Origin from the distal surface of the pisiform bone and from the transverse ligament on the ulnar side of the pisiform. It ends in a slender tendon which runs along the ulnar side of the fifth metacarpal to its
Insertion into the ulnar side of the base of the first phalanx of the fifth digit.
M. flexor brevis digiti quinti ([Fig. 89], h; [Fig. 88], e).—This covers the ventral surface of the fifth metacarpal, and is really the interosseus of this digit.
Origin by fleshy fibres from the ventral surface of the base of the fifth metacarpal; from the ventral process of the unciform bone, and from the transverse ligament proximad of the fifth metacarpal.
Insertion by fleshy fibres into the ventral border of the proximal end of the first phalanx of the fifth digit.
M. opponens (adductor) digiti quinti ([Fig. 89], g).
Origin by a flat tendon from the ventral surface of the os magnum on the ulnar side of the adductor pollicis (b). It passes toward the ulnar side and distad, the fibres diverging to their
Insertion (1) into nearly the whole of the radial surface of the fifth metacarpal, (2) into the base of its first phalanx.