THE MUSCLES OF THE LIMBS. 



53 



of the distal phalanx, a tendon of the flexor perfarans. Thus 

 there are special depressors, or flexors, for each segment of 

 the digit. There appear, at fii-st, to he but three elevators, 

 or extensors, but, practically, each segment has its elevator. 

 For the tendons of the extensor communis and extensor 

 mmimi digiti are attached to the middle and the proximal 

 phalanges ; and the distal phalanx is specially elevated by 

 the tendons of two little muscles, which, in Man, are 

 usually mere subdivisions of the interossei, and pass upwards, 



Fig. 17. 



fig. 17.— Part of the middle digit of the manus of an Oraiig with the 

 flexors and extensors of the phalanges :—»nep., metacarpal bone; 

 Ph. 1, Ph. 2, Ph. 3, the three phalanges ; Est. 1, the deep long ex- 

 tensor tendon from the extensor indicis ; Ext. 2, the superficial long 

 extensor tendon from the extensor communis; I.e. the interosseous 

 short extensor ; If. the interosseous short flexor ; F.pns. the deep 

 long flexor (perforans) ; F.pts. the superficial long flexor (perforatus). 



joining the extensor sheath, to be finally inserted into the 

 distal phalanx. 



The fifth digit of the pes, or little toe, sometimes pre- 

 sents the same disposition of muscles, namely : 



On the dorsal aspect : first, the peronaeus tertius for the 

 metatarsal bone ; secondly, one tendon from the extensor 

 digitorum hrevis, biit this last is commonly absent in Man ; 

 thirdly, one tendon from the extensor digitorum longus. 



On the ventral aspect : first, the peronceus brems, attached 



