Capitate

Capitatetate bone is the largest of the carpal bones, and occupies  the distal row in the center of the wrist.

It has

• A rounded portion or head, which is received into the concavity formed by the scaphoid and lunate bones
• A constricted portion or neck
• The body. The bone is also found in many other mammals, and is homologous with the “third distal carpal” of reptiles and amphibians.

Carpal Bones - Distal and Proximal Rows Proximal: A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform Distal: E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate

Capitatus in Latin means having a head.

Left Capitate Bone

Surfaces & Articulations

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 fourth metacarpal bones, that for the third being the largest.

The dorsal surface is broad and rough.

The volar 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 trapezoid by a small facet at its anterior inferior angle.

The medial surface articulates with the hamate nt.

The capitate articulates with seven bones

• Scaphoid and lunate proximally
• Second, third and fourth metacarpal distally
• Trapezoid on the radial side, and hamate on the ulnar side.

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