308 



dorso-laterallj from the central canal. Where the XIP^' nucleus 

 appears in tlie sections the dorsal X"^'' has already 25-35 cells, of a 

 similar size as those of the XII'''. More frontally this relation changes 

 because the cells of the XII acquire a larger size. 



Located originally dorsally from the XII it acquires — similarly as 

 in the horse — a more perpendicular position after having increased 

 in its lateral border. Then we find again the pyramidal form, also 

 present in the other animals described till now, the top of the 

 pyramid being directed towards the floor of the ventricle. The nucleus 

 then lies dorso-laterally from the XII. For the rest its relation is 

 very similar to that of the cow. Here also the nucleus extends several 

 sections — 48 — in front of the caudal limit of the VID'^ nucleus. 



Sus scrofa domesticus. The dorsal motor ^"^ nucleus extends 

 over 240 sections of 15 »/. The calamus is found in section 118, 

 counted from the caudal pole, so that the spinal and bulimr division 

 of the oblongata contain about equal parts of it (compare fig. 2). 



The nucleus begins wilh some fairly large cells dorso-laterally 

 from the central canal caudally from the hind pole of the XII^'^ 

 nucleus. The nucleus enlarges (contrary to the condition found in 



the foregoing animals) at its mesial border. 

 This medial part increases considerably. 

 '," ' The nucleus first lies entirely dorsally, 



•.;-. ■ X then dorso-laterally from the XII (fig. 5) 

 as a pyramid of which (contrary to the 

 'i'-'V'V-i- foregoing animals) the base is directed 

 "i' towards the floor of the ventricle. The 

 greater number of its cells — amongst 

 '** • .• * which a good many of the large motor 



.',*•• *,. *' XII type — is about 150 in one section, 

 •* * \'' /• The largest size is attained in the middle. 



- . •■', • This size is kept as far as the frontal third 



pjo- 5. piii't of the nucleus in which the number 



Section lluough tiie dorsal of cells gradually declines, 

 motor X nucleus and the XII Similarly as in the other animals de- 

 nucleus of Sus scrofa domesticus. seribed, the dorsal motor nucleus of the 

 X}^^ extends several sections — 42 • — in front of the caudal limit 

 of the VII nucleus. 



Canis faiiiiHarls. The dorsal motor nucleus of the X^^'' covei'S 278 

 sections of 10 fi in the dog. In section 125, counted from the hindpole, 

 the calamus is found, so that a little less than the half of it is located 



