OSTEOLOGY. 29 



THE CARPUS. 



The carpus, seven in number, are divided into a superior and 

 an inferior row. 



The superior row are named from without inward — the ( i) 

 pisiform or super-carpal, (2) cuneiform, (j) semi-lunar, 2iX\A {4) 

 scaphoid. 



The inferior row are named — 



(7) Unciform, {2) os magnum and (j) trapezoid. 



The (7) super-carpal has an exterfial convtx face, an internal 

 concave face and a circumference, free except anteriorly, where it 

 articulates with the radius and cuneiform. 



The (2) cuneiform is wedge-shaped, and articulates with the 

 radius, super-carpal, semi-lunar, and unciform. 



The (j) semi-lunar is half-moon shaped and articulates with 

 the cuneiform, scaphoid, radius, unciform and magnum. 



The (^^j scaphoid is boat-shaped and the largest of the row, 

 articulating with the radius, semi-lunar, magnum and trapezoid. 



The imciform is hook-shaped and articulates with the cunei- 

 form, semi-lunar, magnum, external and middle metacarpals. 



The (2) OS magnum, Xht \2iXgtst, articulates w^\t\\ih.t semi-lunar, 

 scaphoid, unciform, trapezoid, internal and middle metacarpals. 



The (j) trapezoid, resembling the samje geometrical figure, 

 articulates with the scaphoid, magnum, middle and internal met- 

 acarpals. 



THE ^TETACARPUS. 



This region consists of three portions, the middle or principal, 

 and two lateral, the external and internal metacarpals. 



The principal metacarpal '^how^ — 



A shaft, smooth and rounded in front, flattened behind, with ar- 

 ticular surfaces on each side for the rudimentary bones ; at its 

 upper third the nutrient foramen. 



An upper extremity articulating with the inferior carpal row. 



An infei-ior extremity, showing two articular condyles separated 

 by a median ridge. On each side are ligamentous depressions. 



The rudimentary tnetacarpals (or splint-bones) show a superior 

 extremity articulating with the inferior carpal roiv, an inferior 

 extremity extending as far as the lower fourth of the middle bone 

 and ending in a button and a shaft yN\\\i three surfaces, an anterior, 

 articulating with the middle, extej-nal and intej'nal smooth ones. 



The internal is the thicker and longer, and has two articular 

 facets above. 



