*$"* 



hypoq 



qanq 

 Fror 



nod. J J 



Fig. 2. Dissection of an 8.5 mm. pig showing Froriep's ganglion with a distal 

 root to the hypoglossal nerve, and a double cervical ganglion. 



rrujelencephalon 



gang.hypoql. ,._/ 



gang / 



Froriep _/ 



nod _/.__ 



-m>~ qanq iup 



qanqjuqul. 

 TXT. 



__ qanq petros 



v- 



__ qcingnodos 





Fig. 3. Dissection of a 9 mm. pig showing an early stage in the differentiation 

 of the neural crest to form the hypoglossal ganglia. 



