84 PHYSIOLOGICAL SERIES. 



is removed, to show the intervening semilunar cartilages 

 and crucial ligaments. This joint has in this animal a 

 partial septum extending across it (apparently a greater 

 development of what is called Ligamentum mucosum in 

 the human subject), which divides it into an anterior and 

 posterior cavity. 0. C. 296. Hvnterian. 



B. 177. A vertical section of the parts constituting the knee- 

 joint of the same animal, showing the ligamentum mucosum, 

 producing an almost distinct anterior cavity between the 

 patella and condyle of the femur, and a posterior one 

 between the trochlea and head of the tibia. 0. C. 270. 



Hrmterian. 



B. 178. The counterpart of the preceding preparation. 0. C. 271. 



Hunterian. 



B. 179. Left knee-joint of Lemur mongoz, opened from behind. 

 The posterior extremity of the external semilunar cartilage 

 is attached by a long ligament to the outer surface of the 

 internal condyle of the femur. In a similar way the 

 internal semilunar cartilage is attached by ligament to the 

 inner surface of the head of the fibula. The external 

 lateral ligament is double ; its inner fasciculus may 

 represent a divorced portion of the popliteus tendon. 



Presented l>y Prof. F. G. Parsons. 



B. 180. The parts constituting the Human knee-joint. 



The patella and part of the capsule are turned down to 

 show the ligamentum mucosum within the joint and the 

 anterior crucial ligament ; the extent of the synovial 

 membrane and the line of its reflection upon the condyles 

 of the femur ; the capsule is removed from the posterior 

 part of the joint to show the interarticular semilunar 

 cartilages and the posterior crucial ligament. The lateral 

 ligaments and part of the tendon of the popliteus are also 

 shown. 0. C. 265 A. 



B. 181. The interarticular semilunar cartilages from the Human 

 knee-joint, injected ; showing their transverse connecting 



