The trapezium bone or greater multangular bone is a carpal bone situated at distal row on the radial side of the carpus, between the scaphoid and the first metacarpal bone.
Carpal Bones - Distal and Proximal Rows Proximal: A=Scaphoid, B=Lunate, C=Triquetral, D=Pisiform Distal: E=Trapezium, F=Trapezoid, G=Capitate, H=Hamate
Surfaces and Articulations
The inferior surface is oval, concave from side to side, convex from before backward, so as to form a saddle-shaped surface for articulation with the base of the first metacarpal bone.
The dorsal surface is rough.
Left Trapezium Bone, Lesser Multangular means Trapezoid and navicular is another name for scaphoid
The palmar surface is narrow and rough. At its upper part is a deep groove, it transmits the tendon of the Flexor carpi radialis.
The lateral surface is broad and rough, for the attachment of ligaments.
The medial surface presents two facets; the upper, large and concave, articulates with the trapezoid; the lower, small and oval, with the base of the second metacarpal.
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