DEVELOPMENT OF THE NUCLEI PONTUS IN MAN 



53 



Along the raphe can be found a few cells, the remains of the con- 

 necting bridge, and these persist in this position even in the adult. 

 Farther laterally one may often find small isolated masses at 

 almost any point along the periphery of the medulla, the number 



Roof Attachment 



SubstonliaJ j|| 

 Gelatmosa. V-. '.''J§VljS 



1 ivo- arcuate migration ^*N.Hypoglossu5 



10 



11 



12 



Fig. 10 Cross section through the lower olivary region of a 30 mm. fetus. X 

 16.5. (No. 86, si. 28, sect. 13). 



Fig. 11 Camera lucida tracing of a cross section through the lower olivary 

 region of a 96 mm. fetus. X 8.2. (No. 484, si. 3, row 2, sect. 7). 



Fig. 12 Camera lucida tracing of a cross section through the lower olivary 

 region of a 143 mm. fetus. X 7.3. (No. 508, si. 3, row 4, sect. 2). 



and amount varying with different brains. These represent 

 portions of the basilar nuclei which have not descended to the 

 position of the arcuate nuclei proper. It will be remembered that 

 in No. 508 many of the pontine nuclei are assuming ganglionic 



