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First metacarpal bone

Bone: First metacarpal bone

The first metacarpal (Left)

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.

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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.

v • d • e Bones of upper limbs
Pectoral girdle, clavicle	conoid tubercle - trapezoid line - costal tuberosity - subclavian groove
Scapula	spine of scapula - suprascapular notch - acromion - glenoid cavity - glenoidal labrum - coracoid process - fossae (subscapular, supraspinatous, infraspinatous) - borders (superior, lateral/axillary, medial/vertebral) - angles (superior, inferior, lateral) - tubercles (infraglenoid, supraglenoid)
Humerus	upper extremity: necks (anatomical, surgical) - tubercles (greater, lesser) - intertubercular sulcus body: radial sulcus - deltoid tuberosity lower extremity: capitulum - trochlea - epicondyles (lateral, medial) - supracondylar ridges (lateral, medial) - fossae (radial, coronoid, olecranon)
Forearm	ulna: upper extremity (olecranon, coronoid process, tuberosity, radial notch, semilunar notch) - body of ulna - lower extremity (styloid process) radius: upper extremity (tuberosity) - body - lower extremity (ulnar notch, styloid process)
Hand	carpus: scaphoid - lunate - triquetral - pisiform - trapezium - trapezoid - capitate - hamate (hamulus) - metacarpus: 1st metacarpal - 2nd - 3rd - 4th - 5th - phalanges of the hand