First metacarpal bone
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| Bone: First metacarpal bone | |
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| The first metacarpal (Left) | |
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| Bones of the left hand. Dorsal surface. | |
| Latin | ossa metacarpalia I |
| Gray's | subject #55 228 |
| MeSH | Metacarpal+Bones |
The first metacarpal bone (metacarpal bone of the thumb) which connects to the thumb is shorter and stouter than the others, diverges to a greater degree from the carpus, and its volar surface is directed toward the palm.
The body is flattened and broad on its dorsal surface, and does not present the ridge which is found on the other metacarpal bones; its volar surface is concave from above downward.
On its radial border is inserted the opponens pollicis muscle; its ulnar border gives origin to the lateral head of the first Interosseus dorsalis.
The base presents a concavo-convex surface, for articulation with the greater multangular; it has no facets on its sides, but on its radial side is a tubercle for the insertion of the Abductor pollicis longus.
The head is less convex than those of the other metacarpal bones, and is broader from side to side than from before backward.
On its volar surface are two articular eminences, of which the lateral is the larger, for the two sesamoid bones in the tendons of the flexor pollicis brevis muscle.
See also
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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
