84 



DISSECTION OF THE DOG 



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

 the patella. 



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

 sciatic nerve. 



m. glutoeus profundus 

 m. pinformis ^^ 

 m. obturator intermis^^ 

 mm. gemelli^ 



a. glutcea caudcUis 



n. cutanms femoris posterior'" 

 jin. to m. biceps femoris, d:c. '' 



m. semimembranosus 



m. semitendinosus 



n. cutanetis sur(S lateralis—' 

 n. tibialis -- 



m. gracilis 



■ m. gastrocnemius - 

 771. plantaris- - 



^^'■a. glutcea cranialis 



n. glutceus cranialis 



m. sartorius 



m. rectus femaris 



— n. glutaus mudalis 

 m. guadratus femoris 

 m. vastus lateralis 



m. adductor 



.n. to m. abductor cruris 



posterior 



m. semimembranosus 



a. femoris posterior 



^ n. peroncEus communis 



~~m. tibialis anterior 

 m. peroncEus longus 



~m. flexor hallucis longus- 

 m. extensor digitorum longua 



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. iscHiADicus. — 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 \\ith 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. 



