|Bone: Second metacarpal bone
| The second metacarpal. (Left.)
| Bones of the left hand. Dorsal surface.
|| ossa metacarpalia II
|| subject #55 228
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.
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 As such, some of the information contained herein may be outdated.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.
|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|