|Left hand anterior view (palmar view). Trapezoid bone shown in red.|
|The left capitate bone.
Left: ulnar surface (little-finger-side surface).
Right: radial surface (thumb-side surface)
|Latin||Os capitatum; os magnum|
|Gray's||subject #54 226|
The capitate bone is the largest of the carpal bones in the human hand, and occupies the center of the wrist. It presents, above, a rounded portion or head, which is received into the concavity formed by the scaphoid and lunate bones; a constricted portion or neck; and below this, the body. The bone is also found in many other mammals, and is homologous with the "third distal carpal" of reptiles and amphibians.
The etymology derives from the Latin capitātus, "having a head," from capit-, meaning "head."
The dorsal surface is broad and rough.
The lateral surface articulates with the lesser multangular by a small facet at its anterior inferior angle, behind which is a rough depression for the attachment of an interosseous ligament. Above this is a deep, rough groove, forming part of the neck, and serving for the attachment of ligaments; it is bounded superiorly by a smooth, convex surface, for articulation with the scaphoid bone.
The medial surface articulates with the hamate bone by a smooth, concave, oblong facet, which occupies its posterior and superior parts; it is rough in front, for the attachment of an interosseous ligament.
The capitate articulates with seven bones: the scaphoid and lunate proximally, the second metacarpal, third metacarpal, and fourth metacarpal distally, the lesser multangular on the radial side, and the hamate on the ulnar side.
- Gray's Anatomy (1918). See infobox.
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