266 



INFERIOR EXTREMITY 



backwards between it and the tibialis anterior. The tendon 

 of the extensor digitorum longus descends in front of the 

 ankle-joint, and, passing through the transverse and cruciate 

 ligaments (p. 261), divides into four pieces, which diverge 

 from each other on the dorsum of the foot to reach the 

 four lateral toes. On the dorsum of the first phalanx each 

 of the three lateral slips is joined, on the lateral side, by a 

 tendon from the extensor digitorum brevis. 



The manner in which the four tendons of the extensor 

 digitorum longus are inserted, on the dorsal surfaces of the 



M. ext. hallucis longus 

 M. ext. dig. longus j 

 M. peronaeus brevis v 

 N. peronaeus superf. 



I-, M. flex. dig. long. 



A. tibialis post. 



,N. tibialis (O.T. 

 posterior tibial) 



M. plantaris 



N. suralis 

 FIG. 97. Transverse section through the Calf of the Leg. 



four lateral toes, is so similar to that in which the correspond- 

 ing tendons of the fingers are attached, that a very brief 

 description will suffice. An expansion is formed on the 

 dorsal surface of the first phalanx; this is joined by the 

 slender tendons of the lumbrical and interosseous muscles, 

 and divides into a central and two lateral slips. The central 

 slip is inserted into the base of the second phalanx, whilst 

 the stronger lateral slips are prolonged onwards, and, uniting 

 with each other, gain insertion into the base of the ungual 

 phalanx. The extensor digitorum longus is supplied by the 

 deep peroneal nerve. 



M. Extensor Hallucis Longus. The extensor hallucis 



