116 



TOPOGRAPHICAL ANATOMY OF 



ligament, the deep gluteal muscle, the extra-pelvic part of the 

 internal obturator, the gemelli, and (possibly) the quadratus femoris 

 muscles. It is covered by the middle gluteal, piriformis, and biceps 

 muscles. 



Only one small collateral branch leaves the sciatic nerve. This is 



M. piriformis 



M. glutanis superflcialis.-- 



M. glutreus medius. 



Jf. gluteus profundus. 



— M. vastus lateralis 



M. adductor 



M. plantai is 



Lig. collaterale fibulare. 

 M. popliteus. 



M. gastrocnemius 

 (caput laterale). 



Mm, peronams tertius et ex- 

 tensor digitorum longus. 



Fig. 75. — Lateral Aspect of the Femur, with Areas of Muscular arid 

 Ligamentous Attachment. 



distributed to the internal obturator, gemelli, and quadratus femoris 

 muscles. The twig to the internal obturator enters the pelvis by the 

 anterior part of the lesser sciatic foramen. 



K tibialis. — The tibial nerve is the larger and more posterior of 

 the two nerves into which the sciatic divides. It runs down the back 

 of the thigh. between the biceps (lateral) and the adductor and semi- 

 membranosus muscles (medial), to disappear from the present dissec- 

 tion by entering the gap between the two heads of the gastrocnemius 



