Second metacarpal bone

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Bone: Second metacarpal bone
The second metacarpal. (Left.)
Bones of the left hand. Dorsal surface.
Latin	ossa metacarpalia II
Gray's	subject #55 228
MeSH	Metacarpal+Bones

The second metacarpal bone (metacarpal bone of the index finger) is the longest, and its base the largest, after the first metacarpal.

Its base is prolonged upward and medialward, forming a prominent ridge.

It presents four articular facets: three on the upper surface and one on the ulnar side.

Of the facets on the upper surface:

• the intermediate is the largest and is concave from side to side, convex from before backward for articulation with the lesser multangular;
• the lateral is small, flat and oval for articulation with the greater multangular;
• the medial, on the summit of the ridge, is long and narrow for articulation with the capitate.

The facet on the ulnar side articulates with the third metacarpal.

The extensor carpi radialis longus muscle is inserted on the dorsal surface and the flexor carpi radialis muscle on the volar surface of the base.

See also

• metacarpus
• First metacarpal bone
• Third metacarpal bone
• Fourth metacarpal bone
• Fifth metacarpal bone

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

v • d • e Bones of upper limbs
Pectoral girdle, clavicle	conoid tubercle - trapezoid line - costal tuberosity - subclavian groove
Scapula	fossae (subscapular, supraspinatous, infraspinatous) - suprascapular notch - glenoid cavity tubercles (infraglenoid, supraglenoid) - spine of scapula - acromion - coracoid process borders (superior, lateral/axillary, medial/vertebral) - angles (superior, inferior, lateral)
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	radius: upper extremity (head, tuberosity) - body - lower extremity (ulnar notch, styloid process) ulna: upper extremity (tuberosity, olecranon, coronoid process, radial notch, trochlear notch) - body - lower extremity (head, styloid process)
Hand	carpus: scaphoid - lunate - triquetral - pisiform - trapezium - trapezoid - capitate - hamate (hamulus) metacarpus: 1st metacarpal - 2nd - 3rd - 4th - 5th phalanges of the hand: proximal - intermediate - distal

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Acknowledgement and Attribution Regarding Sources of Content

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 .