THE POSTERIOR LIMB 



277 



and ventral border of the iliac wing. Second portion : By 

 a stout round tendon from the inferior anterior spine, im- 

 mediately in front of the acetabulum. This part is cylindri- 

 cal in shape and is almost a separate muscle. 



The two portions of the muscle should be divided. 



(b) The vastus lateralis. Origin: Anterior surface of the great 

 trochanter and the lateral intermuscular ligament (the 

 thickened fascia attached to the lateral surface of the femur 

 behind the proximal 



end of the muscle). 



The muscle should 

 be divided. 



(c) The vastus inter- 

 medius. Origin in two 

 portions. First por- 

 tion: Great trochan- 

 ter, below the origin 

 of the vastus lateralis. 

 Second portion : Ante- 

 rior surface of the 

 femur. 



(d) The vastus medialis. 

 Origin: Medially, 

 at the base of the 

 neck of the femur and 

 the adjacent portion 

 of the shaft. Common 

 insertion (a-d) : Tibial 

 tuberosity. 



B. Flexor group (ham- 

 string muscles) . With the ex- 

 ception of the sartorius, the 

 muscles lie behind the axis of 

 the femur, and are inserted on 

 the medial and lateral sur- 

 faces of the knee-joint and the 

 corresponding proximal por- 



Postenor 



Fig. 104. Transverse section through the middle of 

 the thigh: a.l., adductor longus; a.m., adductor mag- 

 nus; a.s.m., femoral artery-; b.f. 1 and b.f. 2, first and 

 second heads of the biceps femoris; f., femur; gr., 

 gracilis; n.p., peroneal nerve; n.s.m., greater sap- 

 henous" nerve ; n.t., tibial nerve; r.f. 1 and r.f. 2, first 

 and second heads of the rectus femoris; s, sartorius; 

 sm., semimembranosus; St., semitendinosus; t.f.c, 

 tensor fasciae cruis; t.f.l., tensor fasciae latae; v.i. 1 

 and vi. 2, first and second heads of the vastus inter- 

 medius; v.is., sciatic vein; v.l., vastus lateralis; v.m., 

 vastus medialis; v.s.m., great saphenous vein. 



