NOTE ON THE SUPERIOR TIBIO-FIBULAR JOINT. 491 



every case more intimately connected with the deep aspect of 

 the capsular ligament. It is attached to the superior border of 

 the fibular facet, chiefiy at its outer angle. 



In one joint which I opened, there seemed to be an almost 

 complete lamellar septum, internal to the capsular ligament, 

 which entirely covered the fibular head, and presented only a 

 small central aperture (see fig. 2). In this case the tibial 

 attachment was confined to the outer and upper margin of the 

 tibial facet. 



On the whole, it resembles a weak orbicular ligament in 

 appearance. It might be at first thought that the ligament was 

 a part of the capsular ligament ; but this seems unlikely, since 

 its structure difl'ers very materially from that of a capsular 

 ligament. The fibres composing it are delicate, and in many 

 cases lodge a few pellets of fat. In this respect it resembles 

 a synovial fold. 



Whether the structure is present in the foetus I cannot say 

 for certain, since my investigations in that direction were not 

 sufficiently extensive to be conclusive. In one foetus (9 months) 

 there appeared to be a rudiment of this structure in the right 

 joint, in which the knee joint and tibio-fibular articular cavities 

 appeared to communicate, but on opening up the left joint of 

 the same fcetus, I could find no indications of it. 



