Revision as of 08:03, 3 December 2017 edit Mardil (talk \| contribs) Extended confirmed users 606 edits No edit summary ← Previous edit		Revision as of 08:07, 3 December 2017 edit undo Mardil (talk \| contribs) Extended confirmed users 606 edits →Base: Palmar interossei originate on metacarpals II, IV and V Next edit →
Line 38: The base is significantly different from the bases of the other metacarpals. It is trumpet-shaped and ends in a saddle-shaped articular surface matching that of the trapezial articular surface. The configuration of the thumb carpometacarpal joint plays an important role in the mechanism of opposition. The articular surface is delimited by a thick, crest-like ridge extending around its circumference. On the palmar and lateral side of the base is the insertion of the tendon of the [[abductor pollicis longus muscle]], usually featuring a small tubercle. The origin of the first [[~~Palmar~~Dorsal interossei ~~muscles~~of the hand\|~~palmar~~dorsal interosseous muscle]] is on the ulnar aspect of the base, and can sometimes extend onto the shaft. In contrast to the other metacarpals, the first metacarpal has no articular facets on the sides of its base (for intermetacarpal articulations) because it articulates exclusively with the trapezium. <ref name="Doyle-Base">{{harvnb\|Doyle\|Botte\|2003\| loc=Base of the Thumb Metacarpal}}</ref><!-- ref for subsection -->

First metacarpal bone: Difference between revisions