NERVOUS SYSTEM. VERTEBRATA. 505 



D. 799. The spinal cord of a young Gorilla (Anthropopithecus 

 gorilla) with the dura mater removed, and the constituent 

 nerve-roots of the cauda equina separated to either side to 

 show the filum terminale. 



In its general features the cord resembles that of Man. 



O.C. 1375 A. 

 Waldeyer, Abhandl. Akad. Wiss. Berlin, 1888, p. til.' 



D. 800. The vertebral column and spinal cord of an infant, in- 

 cluding the thoracic and lumbo-sacral regions. The vertebral 

 column and dura mater have been divided by a sagittal 

 section and spread apart, exposing the cord. In places 

 the ligamentum denticulatum can be seen, binding the 

 arachnoid membrane to the dura in the interspaces between 

 the nerves. Upon the right side the arachnoid has been 

 stretched away from the pia mater, and shows very clearly. 

 A great part of the cauda equina lies within the common 

 dura mater sheath. Several of the arteries have been 

 injected. O.C. 1378 A. 



Mus. Heaviside. 



D. 801. The medulla oblongata and spinal cord of Man. The 

 dura mater and arachnoid membrane have been sagit- 

 tally divided and spread to either side, thus extending 

 the nerve-roots and showing clearly the subarachnoid 

 tissue and the ligamentum denticulatum. The brachial 

 and crural swellings, the cauda equina and terminal 

 filament are well shown. The gradually increasing obliquity 

 of the course of the spinal nerve-roots towards the 

 hinder end of the cord is very striking, and affords an 

 indication of the shortening of the cord relative to the 

 vertebral column. 0. C. 137 H B. 



Presented by J. Holm, Esq. 



D. 802. " Nearly the whole length of the medulla spinalis, with 

 the cauda equina, of the Human subject. The dura muter 

 is in part removed to show the medulla and the going out 

 of the nerves through that membrane." The arachnoid 

 membrane is well shown upon the ventral surface. 



0. C. 1376. Uunterian. 



