First metacarpal bone: Difference between revisions

Revision as of 07:27, 3 December 2017

Revision as of 07:57, 3 December 2017

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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 an oval-triangular cross-section.

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 exhibitexhibits a blunt ridge which separates a larger lateral part —– the origininsertion 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]].

<ref name="Doyle-Shaft">{{harvnb|Doyle|Botte|2003| loc=Shaft of the Thumb Metacarpal}}</ref><!-- ref for subsection -->