506 PHYSIOLOGICAL SERIES. 



D. 803. " The termination of the medulla spinalis with the ner\ efl 

 cut off. which formed the cauda equina. excepting the la>t 

 nerve, which arises from the very termination of the 

 medulla. It -how- that the medulla is lengthened out in 

 the form of a nerve, and, a- it were, continued into the last 



nerve.*' 



The " last nerve'" of the ahove de>cri|it ion is the degene- 

 rate remains of the hinder part of the cord ( til urn terminalei. 

 and consists mainly of connective tissue and a l'e\v medidlated 

 nervr-tihres. At its anterior end there are vestigea of tin- 

 central canal and grey matter. 0. C. l.">77. 



Hunterian. 



D. 804. A portion of the -pinal cord of Man. showing the roots 

 of the sj)inal ner\e- and the relation- of the protective 

 memhranes to the cord. A strip of dura mater ha- lieen 

 left attached to tlie nerve-roots OH the right side. Ch.-e 

 beneath it upon the ventral surface, hut separated from it by 

 a narrow suhdural space, i- the delicate arachnoid memhrane. 

 The pia mater adhere* closely to the cord ; it has heen 

 removed from the left half of the specimen; it- cut edge 

 can he seen between the termination of the nerve-roots and 

 the ventral Hs.-ure. Within the tiure lie- a lamina of 

 pia mater. The dorsal and ventral ner\ c-root-. as in the 

 Elephant and other mammal-, ari-e from the cord in a cha- 

 racteristic manner thedor-;il i-not- enter the cord abruptly 

 in the dorso-lateral fissure by a few -lout rootlet-; tin- 

 ventral leave it by more numerous branching rootlets that 

 emerge at slightly different distances from the ventral mid- 

 line. 0. C. 1378 F. 



D. 805. A similar -pecimen -howin<_ r the origin of two pair- of 

 spinal nerve-roots. The dura mater has heen removed and 

 the spinal ganglia disserted on the right -ide. 



O.C. 1378c. 



