ELEMENTAR Y ANA TOMY. 



[LESS. 



The lower process is called the coronoid, 1 and is received 

 into the corresponding fossa on the front of the humerus. 



The higher and much larger process is termed the ole- 

 cranon? and fits into the olecranal cavity on the back of 

 the humerus. 



The olecranon forms the prominence of the elbow, and 

 terminates in a rough tuberosity. 



On the outer side of the coronoid process is a small articular 

 surface, called the lesser sigmoid cavity, for the border of the 

 head of the radius, which turns upon it. 



The lower end of the ulna has two eminences. The ex- 

 ternal or radial one, called the head, is much the larger, and 

 presents two articular surfaces. One of these is nearly 

 circular, and articulates with the wrist ; the other, narrow and 

 convex, articulates with a concavity on the adjacent surface 

 of the radius. 



FIG. 126. ANTERIOR (PALMAR) SURFACE OF THE SKELETON OF MAN'S HAND. 



c, cuneiforme ; /, lunare ; m, magnum : / 1 , metacarpal of thumb ; tii 3 m$, meta- 

 carpals of the four fingers ; p, pisiforme ; P 1 , first phalanx of the thumb and 

 four fingers i.e. of the five "digits ;" P 2 , second phalanx of the five digits; 

 P 5 , third, or ungual phalanx ; sc, scaphoides ; t, trapezium ; tz, trapezoides ; 

 71, unciforme. 



The internal eminence is called the sty loid process, and does 

 not directly articulate with the wrist. 



1 Kopcoi/n, the top of a curve. 



2 From uAeo], elbow, and Kpdvov, head. - 



