THE SUFFRAGINIS BONE. 



25 



and forms with the metacarpus an angle of about 130 to 140 

 degrees. In the liind-limbs this angle is greater than in the 

 fore, being usually about 150 degrees. The suffraginis bone is, 

 roughly, one-third 

 the length of the 111 



metacarpus, though 

 a slio-ht difference 

 exists in this re- 

 spect between the 

 fore and hind limbs, 

 the metacarpus 

 beincr somewhat 

 shorter than the 

 metatarsus. The 

 suffraginis bone is 



Antei-o-lateral view of bones of foot. ^4, lower end of 

 metacarpus ; B, pastern ; C, outer sesamoid ; D, coronet ; E, 

 pedal bone. 



divided into an 

 upper, middle, and 

 a lower portion. 



The upper 

 portion is the 

 strongest, and pre- 

 sents an articular 

 surface (fig. 12, a), 

 which is sur- 

 rounded by a 

 somewhat promi- ^lo. n. 

 nent border. It 

 responds exactly 



to tlie anterior half of the lower extremity of the metacarpus 

 or metatarsus. The centre of its articular surface presents a 

 marked depression for the middle prominence of the metacarpus 

 or shin bone, and on either side two shallow depressions for the 

 lateral prominences of the shin bone. The mass of bony tissue 

 forming the upper part terminates on either side in a prominence 

 directed backwards and outwards, to which the ligaments of 

 the joint are attached. 



The middle portion possesses an anterior, a posterior, and two 

 lateral surfaces. The anterior is slightly rounded and fairly 

 smooth ; the posterior is flatter, and exhibits a well-marked 

 roughened triangle (fig. 13, a). This runs from each of the 



