Hamulus of hamate bone

The volar surface of the hamate bone presents, at its lower and ulnar side, a curved, hook-like process, the hamulus, directed forward and lateralward.

This process gives attachment, by its apex, to the transverse carpal ligament and the Flexor carpi ulnaris; by its medial surface to the Flexor digiti minimi brevis and Opponens digiti quinti; its lateral side is grooved for the passage of the Flexor tendons into the palm of the hand.

It is one of the four eminences on the front of the carpus to which the transverse carpal ligament of the wrist is attached; the others being the pisiform medially, the oblique ridge of the greater multangular and the tubercle of the navicular laterally.