The Posterior Limb. 221 



(1) The adductor brevis. Origin: Anterior portion of the 

 symphysis pubis. Insertion: Below the pectineus. 



(m) The adductor longus. Origin: Posterior portion of the 

 symphysis and inferior ramus of the ischium. Insertion: 

 Posterior surface of the shaft of the femur to its distal third. 



(n) The adductor magnus. Origin: Ventral surface of the 

 ischial tuberosity. Insertion: Medial surface of the distal 

 end of the femur, extending to the medial condyle of the 

 tibia. 



3. Muscles arising from the pelvic girdle and the femur and 

 inserted on the proximal portions of the tibia and fibula (extensors 

 and flexors of the leg). (Fig. 76). 



A. Extensor group (quadriceps femoris). The muscles lie 

 for the most part in front of the axis of the femur. They have a 

 common insertidn on the tibial tuberosity through the patella and 

 the patellar ligament. 



(a) The rectus femoris. Origin in two portions : 



First portion: Superior anterior spine, fused with the 

 tensor fasciae latae, and ventral border of the iliac wing. 

 Second portion : By a stout round tendon from the inferior 

 anterior spine, immediately in front of the acetabulum. 

 This part is cylindrical 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 muscle should be divided. 



(c) The vastus intermedi us. Origin in two portions: 



First portion: Great trochanter, below the origin of the 



vastus lateralis. 



Second portion: Anterior surface of the femur. 



(d) The vastus medialis. Origin: Medially, at the base of 

 the coUum femoris and adjacent portion of the shaft. 

 Common insertion (a-d) : Tibial tuberosity. 



B. Flexor group (hamstring muscles). With the exception of 

 ■the sartorius, the muscles lie behind the axis of the femur, and are 



