84 



DISSECTION OF THE DOG 



the other members of the quadriceps group, the lateral vastus is inserted into 

 the patella. 



Dissection. — Reflect the piriformis in order to expose the full length of the 

 sciatic nerve. 



m. gluteus profundu. 

 m. •piriformis \ 



m. obturator internus^ 



\ 

 mm. gemelli^ 



i*. glutcea caudalis 



n, cutaneus femoris posterior 

 nn. to tn. biceps femoris s &c. -" 

 m. semimembranosus 

 m. semitendinous 



m. gracilis 



n. cutaneus surce lateralis 

 n. tibialis ■- 



m. gastrocnemius 



m. planlaris 



_-a. glutcea cranialis 

 n. glutceus cranialis 



m. sartorius 



m. rectus femoris 

 -_'*. glutorus caudalis 



m. quadratus femoris 



m. vastus lateralis 



m. adductor 



n. to m. abductor cruris 

 posterior 



77i. semimembranosus 



a. femoris posterior 

 _w-n. peronmus communis 



Will i ' /ipih I ' '/■--i-m. tibialis anterior 

 ■ / < t _i m. peronants longus 



kwM' [ ' "" 



I/' 1 ?'"/ J', ~ ■ ~~ m. flexor hallucis longus 



ml 



. m . extensor digitorum longus 



Fig. 32. — Dissection of gluteal region and lateral aspect of the thigh after removal of the superficial 

 and middle gluteal muscles and the biceps. 



N. ischiadictjs. — The sciatic nerve is formed by roots from the last three 

 lumbar and the first sacral nerves. Leaving the pelvis by the greater sciatic 

 foramen in company with the gluteal nerves and the caudal gluteal vessels, it 

 reaches the region of the hip- joint where it turns into the thigh, and ends about 

 the distal third of this segment of the limb by dividing into two branches of 

 unequal size — the tibial and common peroneal nerves. The exact point of 

 division of the sciatic nerve is very variable, being occasionally as early as the 

 point at which the hip-joint is passed. 



