146 Anatomy of the; Rabbit. 



surface. To see its origin reflect the tendon through the 

 lesser sciatic notch and examine the muscle from the internal 

 surface of the pelvis. 



(h) The gemellus inferior. Origin: Posterior portion of the 

 superior ramus of the ischium and the ischial tuberosity. 

 Insertion : Trochanteric fossa. 



(i) The quadratus femoris. Origin: Ventral surface of the 

 ischial tuberosity and the superior ramus of the ischium 

 immediately in front of it. Insertion: With (j) in the 

 trochanteric fossa. 



(j) The obturator externus: Origin: External extent of the obtur- 

 ator foramen. Insertion: Trochanteric fossa. The muscle is 

 largely concealed from this surface, but may be fully dis- 

 played by the division of the pectineus and adductores 

 brevis and longus. 

 Dissection on the medial surface posteriorly, after division of 

 the gracilis. 



(k) The pectineus. Origin: Pecten of the pubis. Insertion: 

 Immediately below the lesser trochanter. 



(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. 48.) 



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

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

 insertion 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: Bv a stout round tendon from the inferior 



anterior spine, immediately in front of the acetabulum. This 



part is cylindrical in shape and is practically 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. 



