656 



nucleus will present!}' appear; in other sections similar cells are to 

 be seen still furtlier lateral in the grey matter, directl^y medial from 

 the angle between the anterior and posterior horns. Thereupon the 

 XI nucleus again appears at the sharply defined place described 

 above, and we can see how frontal horn cells of the lateral group 

 have risen so high that they lie in the grey matter between the 

 anterior and posterior horns and form a whole with nucleus XI, so 

 that the impression is repeatedly conveyed as if the XI nucleus at 

 that place is reinforced by frontal horn cells in its most ventral part, 

 or that the XI nucleus itself continues venti'ally along the lateral 

 border of the frontal horn fig. 12). Morefrontally the XI nucleus developed 

 very differently, sometiuies minimally, only to apjjear again stronger 



Fig. 1-2. 

 than before. It then contains as many as 32 cells. At the point of 

 greatest development it is pear-shaped, with the point projecting 

 laterally into the substantia reticularis; many cells exhibit a larger 

 type than formerly, and here also a contact with frontal horn elements 

 can be observed repeatedly (fig. 13). 



When the nucleus again commences to decrease, we frequently 

 see that only the most lateral portion is developed, so that in these 

 sections it lies exclusively in the substantia reticularis : in other 

 places we see that only the middle part of the whole has disappeared 

 and that the nucleus then consists of a medial and a lateral portion, 

 the former at the usual place between the anterior and posterior horns: 

 the latter lying lateral from it in the substantia reticularis 'fig. 14). 



