构造

头状骨是腕骨中最大的一块，位于腕骨远端列。头状骨的旁边接的是无名指掌骨，，尺骨侧连接的是钩骨，桡侧连接三角骨，腕侧结月骨跟手舟骨。:708–709

表面

The superior surface is round, smooth, and articulates with the lunate bone.

The inferior surface is divided by two ridges into three facets, for articulation with the second, third, and fourthmetacarpal bones, that for the third being the largest.

The dorsal surface is broad and rough.

The palmar surface is narrow, rounded, and rough, for the attachment of ligaments and a part of the adductor pollicis muscle.

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.

变形

The capitate bone variably articulates with the metacarpal of the index finger.

骨化

头状骨的骨化始于1至5个月大时。