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Concept
Hamate bone
Summary
The hamate bone (from Latin hamatus, "hooked"), or unciform bone (from Latin uncus, "hook"), Latin os hamatum and occasionally abbreviated as just hamatum, is a bone in the human wrist readily distinguishable by its wedge shape and a hook-like process ("hamulus") projecting from its palmar surface.
The hamate is an irregularly shaped carpal bone found within the hand. The hamate is found within the distal row of carpal bones, and abuts the metacarpals of the little finger and ring finger.
Adjacent to the hamate on the ulnar side, and slightly above it, is the pisiform bone. Adjacent on the radial side is the capitate, and proximal is the lunate bone.
The hamate bone has six surfaces:
The superior, the apex of the wedge, is narrow, convex, smooth, and articulates with the lunate.
The inferior articulates with the fourth and fifth metacarpal bones, by concave facets which are separated by a ridge.
The dorsal is triangular and rough for ligamentous attachment.
The palmar presents, at its lower and ulnar side, a curved, hook-like process, the hamulus, directed forward and laterally.
The medial articulates with the triangular bone by an oblong facet, cut obliquely from above, downward and medialward.
The lateral articulates with the capitate by its upper and posterior part, the remaining portion being rough, for the attachment of ligaments.
The hook of hamate (hamulus) is found at the proximal, ulnar side of the hamate bone. The hook is a curved, hook-like process that projects 1–2 mm distally and radially. The ulnar nerve hooks around the hook of hamate as it crosses towards the medial side of hand.
The hook forms the ulnar border of the carpal tunnel, and the radial border for Guyon's canal. Numerous structures attach to it, including ligaments from the pisiform, the transverse carpal ligament, and the tendon of Flexor carpi ulnaris.
Its medial surface to the flexor digiti minimi brevis and opponens digiti minimi; its lateral side is grooved for the passage of the flexor tendons into the palm of the hand.
Official source
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