First metacarpal bone: Difference between revisions

Revision as of 10:49, 22 April 2013

Revision as of 02:50, 17 August 2013

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=== Body/Shaft ===

The body or shaft is thick and broad — averaging {{convert|6|to|11|mm}}. On its dorsal side, the shaft is flat and wide, while the anteroposterior side is less pronounced; usually resulting in a oval-triangular cross-secionsection.

The dorsal surface of the shaft is weakly convex longitudinally, while its palmar, radial, and ulnar surfaces tend to be concave. The palmar (medial) surface exhibit a blunt ridge which separates a larger lateral part — the origin of the [[opponens pollicis muscle]] — and a smaller medial part — the origin of the lateral head of the first [[Dorsal interossei of the hand|dorsal interosseous muscle]].