220 Anatomy of the Rabbit. 



fascia of the lateral surface of the thigh. The muscle is 

 fused with the first head of the rectus femoris in front, and 

 with the second, portion of the glutaeus maximus behind. 



(e) The piriformis. Origin: Lateral portions of the second 



and. third sacral vertebrae. Insertion: Tip of the great 



trochanter. 



The muscle should be divided, care being taken to avoid injury to 

 the nerves and bloodvessels beneath it. 



(f) The gemellus superior. Origin: Tendinous from the 

 ischial spine and. fleshy from the body of the ischium imme- 

 diately in front of it. Insertion: Lateral wall of the tro- 

 chanteric fossa. 



The muscle extending from the ischial spine to the sacrum is the 

 abductor caudae anterior (p. 270). 



(g) The obturator internus. Origin: Internal extent of the 

 obturator foramen. Insertion: Trochanteric fossa. The 

 muscle passes over the ischium in the lesser sciatic notch, 

 only its insertion portion appearing from the lateral 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: The superficial fibres 

 are inserted, on and below the third, trochanter, the remaining 

 ones below the trochanteric fossa. 



(j) The obturator extern us: Origin: External extent of the 

 obturator foramen. Insertion: Trochanteric fossa. The 

 muscle is largely concealed from this surface, but may be 

 fully displayed by the division of the pectineus and adduc- 

 tores 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. 



