262 



POSTERIOR FEMORAL REGION. 



Fig. 105.* posed. By its inner border with 



the gracilis ; and by its outer border 

 with the biceps. 



These two muscles must be dis- 

 sected from the tuberosity of the 

 ischium, to bring into view the 

 origin of the next. 



The SEMI-MEMBRANOSUS, re- 

 markable for the tendinous expan- 

 sion upon its anterior and posterior 

 surface, arises from the tuberosity 

 of the ischium, in front of the com- 

 mon origin of the two preceding 

 muscles. It is inserted into the 

 posterior part of the inner tubero- 

 sity of the tibia; at its insertion the 

 tendon splits into three portions, 

 one of which is inserted in a groove 

 on the inner side of the head of the 

 tibia, beneath the internal lateral 

 ligament. The second is continuous 

 with an aponeurotic expansion that 

 binds down the popliteus muscle, 

 the popliteal fascia ; and the third 

 turns upwards and outwards to 

 the external condyle of the femur, 

 forming the middle portion of the 

 posterior ligament of the knee- 

 joint (ligamentum posticum Wins- 

 lowii). 



The tendons of the last two 

 muscles viz. the semi-tendinosus 

 and semi-membranosus, with those 

 of the gracilis and sartorius, form 

 the inner ham-string. 



Relations. By its superficial 

 surface with the gluteus maximus, 

 biceps, semi-tendinosus, fascia lata, 



and at its insertion with the tendinous expansion of the sartorius. 



By its deep surface with the quadratus femoris, adductor magnus, in- 



* The muscles of the posterior femoral and gluteal region. 1. The gluteus 

 medius. 2. The gluteus maximus. 3. The vastus externus covered in by 

 fascia lata. 4. The long head of the biceps. 5. Its short head. 6. The 

 semi-tendinosus. 7- The semi-membranosus, 8. The gracilis. 9- A part of 

 the inner border of the adductor magnus. 10. The edge of the sartorius. 

 11. The popliteal space. 12. The gastrocnemius muscle; its two heads. 

 The tendon of the biceps forms the outer hamstring ; and the sartorius with 

 the tendons of the gracilis, semi-tendinosus, and semi-membranosus, the inner 

 hamstring. 



