OSTEOLOGY. 2 9 



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, (3) semi-lunar, and (4) 

 scaphoid. 



The inferior row are named 



(i) Unciform, (2) os magnum and (3) trapezoid. 



The (i) super-carpal has an external convex 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 (3) semi-lunar is half -moon shaped and articulates with 

 the cuneiform, scaphoid, radius, unciform and magnum. 



The (4) scaphoid is boat-shaped and the largest of the row, 

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



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

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



The (2) 05 magnum, the largest, articulates with the semi-lunar, 

 scaphoid, unciform, trapezoid, internal and middle metacarpals. 



The (3) trapezoid, resembling the same geometrical figure, articu- 

 lates with the scaphoid, magnum, middle and internal metacarpals . 



THE METACARPUS. 



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

 and two lateral, the external and internal metacarpals. 



The principal metacarpal shows 



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 inferior extremity, showing two articular condyles separated 

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



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

 extremity articulating with the inferior carpal row, an inferior 

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

 and ending in a button and a shaft with three surfaces, an anterior, 

 articulating with the middle, external and internal smooth ones. 



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

 facets above. 



