DISSKCTION or Tin-; |mm, 



01 



M. bxtbnsob digitoruw bbbvis. The short extensor of the di^'it> is 

 oonfined to the dorsum of the pes. Its three heads arise from the calcaneus 

 and the anterior ligamenl of the tarsus. Of its three tendons, the most 

 lateral goes to tin- fourth 



di'_ r it ; the middle <>iic to the m. umbnentbranonw- 



third and fourth digits ; and 

 the medial tendon to tin- 

 second and third digits. 

 Their union with the tendons 



,-m. tattiu int, ■ 



of the long extensor is 

 blended with the tendons of 

 the interosseous muscles. 



M. BXTBNSOB HAJLLUCIS 



LONOUS. This is a thin 

 muscle arising from the 

 lateral surface of the fibula 

 about the junction of the 



proximal and middle thirds. 

 It lies, at first, between the 

 long extensor and the tibia, 

 then between the anterior 

 tibial and the long extensor 

 muscles, and has a variable 

 insertion. It may end on 

 the rudimentary first meta- 

 tarsal hone. 



a. tibialis 



tn. semitendinosuf 



tn. gastrocnemius — 

 f. saphena pana - ■ 



tn. planlans 



.n. peronceus 

 communis 



m. tibiaJit anterior 



m. peronceus Inngus 



m flexor hallucis longus 



m. extensor digUorum longus 



m. peronceus brevis 



m. abductor digili 



quinti 



m. extensor digUorum brevis 



Dissection. — The dissec- 

 tion of the common • 

 peroneal nerve and it- 

 branches and the an- 

 terior tibial vessels will 

 be facilitated by the 

 reflection of the long 

 peroneal muscle. The 

 muscle should be cut 

 across about the mid- 

 dle of its fleshy belly. 



To follow the deep peroneal nerve and the anterior tibial artery, it is 

 necessary to reflect the short extensor muscle also. 



N. peronceus communis. — The common peroneal nerve is the smaller of 

 the two terminal branches of the sciatic. Beginning about the middle of 

 the thigh, it crosses the gastrocnemius and deep flexor of the digit under 



Fig. 36. — Dissection of the lateral aspect of the leg. 



