690, MR. F. G, PARSONS ON THE [June 16, 
mentum teres is a very strong fibrous band, which, in the usual 
position of the joint, passes upward and outward to the head of the 
femur and takes the greater part of the strain of the jot; above 
it is a synovial fold containing fat. 
— The Knee-joint, like the hip, is never fully extended, the capsule 
is strengthened by strong lateral ligaments; the external lateral 
runs downward and backward from the external condyle to the 
front of the head of the fibula; its anterior fibres are continuous 
with the origin of the extensor longus digitorum. The popliteus 
also performs the function of an external lateral ligament, since it 
is attached above to the femur and fabella, and below to the 
external semilunar cartilage and the head of the fibula. During 
extreme flexion, which is the usual position of the joint, the 
Fig. 4. 
ice 
Knee-joint of Petrogale laid open. 
Pat. Patella. P.C. Posterior crucial ligament. 
F. Head of fibula. P. Popliteus tendon. 
Q,.E. Quadriceps. E.S. External semilunar cartilage. 
8.M. Synovial membrane. LS. Internal do. 
L.M. Ligamentum mucosum. E.L. External lateral ligament. 
A.C. Anterior crucial ligament. I.L. Internal do. 
