222 ANATOMY OF THE RABBIT. 
inserted on the medial and lateral surfaces of the knee-joint and the 
corresponding proximal portions of the leg. They form the bound- 
aries of the popliteal fossa. 
(a) The sartorius. 
Patenior Origin: — Posterior 
portion of the in- 
guinal ligament, es- 
pecially its sacral 
extension. Inser- 
tion: Medial con- 
dyle of the tibia. 
This is an extremely 
thin and narrow 
band of fibres, lying 

Lateral 6 
on the more anterior 
portion of the med- 
ial surface of the 
thigh. The muscle 
is fused distally with 
the gracilis. It has 
the position of a 
rotator muscle, and 
is .only a flexor 
through its connec- 
tion with the latter. 
(b) The gracilis. Ori- 
Pees gin: The entire ex- 
Fic. 76. Transverse section through the middle tent of the pubic 
of the thigh: a.l., adductor longus; a.m., ad- F a 
ductor magnus; b.f.1 and b.f.2, first and second symphysis. Insér- 
heads of the biceps femoris; f.,femur; gr., gracilis; - 
n.p., peroneal nerve; n.s.m, greater saphenous nerve; tion: Through a 
n.t., tibial nerve; r.f.1 and r.f.2, first and second 3 
heads of the rectusfemoris; s, sartorius; sm.,semimem- broad tendinous ex- 
branosus; st., semitendinosus; t.f.c., tensor fasciae 3 . . 
cruris; t.f.l., tensor fasciae latae; v.i.1 and v.i. 2, first pansion ending In 
and second heads of the vastus intermedius; v.is. 3 
sciatic vein; v.l., vastuo lateralis; v.m., vastus medialis; the fascia of the 
v.s.m., great saphenousvein. 
proximal portion of 
the medial surface of the thigh. The muscle forms a broad, com- 
paratively thin sheet, covering the posterior portion of the medial 
surface of the thigh. Its insertion tendon is perforated 
