100 



TOPOGEAPHICAL ANATOMY OP 



is a satisfactory separation possible in the horse that it appears 

 unnecessary to describe the muscle as other than a single structure. 



M. SEMIMEMBRANOSUS.— This is the largest and most posterior of 

 the muscles at pi^esent being examined. Its main origin is from the 

 ventral and medial part of the sciatic tuber and the ventral surface of 

 the ischium adjoining the sciatic arch. A slenderer head, arising from 



V. iliaca exteran. 



A. iliaca externa 



Truncus pudendoepigastricus 



N. femoralis 



Anterior femoral vessels,- 

 N. saphenus. - 



Penioral artery and vein. - 

 il. rectus femoris. - 

 A. saphena. 



"M. pectineus. 

 M. vastus niedialis. 



A. genu suprenia. 



iM. adductor. 



jM. semimembranosus \I^' 



A. profunda femoris. 

 Lig-. accessoriuni. 



V. pudenda externa. 

 ' ; ' M obturator externus. 



Symphysis of iscliium. 



N to m. gracilis. 

 0))turator vessels. 



^ M iliopsoas. 



M. quadratus femoris. 



N tibialis. 



N peionjeus communis. 



M biceps femoris. 



_ Postenoi femoral vessels. 

 „ Al semitendmosus. 

 M gastrocnemius. 



;M. popliteus. 



Fig. 67. — Deep Dissection of the Medial Aspect of the Thigh. 



the transverse process of second (possibly also the first) coccygeal 

 vertebra and the edge of the sacro-tuberous ligament, passes over the 

 sciatic tuber, beyond which it joins the larger main head. A synovial 

 bursa may intervene between the muscle and the tuber. 



The short tendon of insertion of the semimembranous is attached to 

 the medial epicondyle of the femur and the medial collateral ligament 

 of the femoro-tibial joint, along with part of the insertion of the 

 adductor, while beyond this it becomes continuous with the fascia of 

 the leg. 



The term/emoraZ triangle (trigonum femorale) is applied to a space 

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