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m Disambiguate Dorsal interossei muscles to Dorsal interossei of the hand using popups |
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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 a oval-triangular cross-secion.
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
<ref name="Doyle-Shaft">{{harvnb|Doyle|Botte|2003| loc=Shaft of the Thumb Metacarpal}}</ref><!-- ref for subsection -->
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