302 



]■'. H. EDOEWOKTH. 



coalescing spinal segments in Amphibia, Sauropsidaj and 

 Mammalia — viz. 2 or 3, 4 or 5, and 3 — harmonises with the 

 evidence of the cranial muscles, in which there is a closer 

 similarity between Mammalia and Amphibia than between 

 Mammalia and Sauropsida. 



A Suggested Morphological Classification of the Motor 

 Centres of the Mid- and Hind-Brain in Man. 



Gaskell divided the motor centres of the cranial nerves 

 Text-fig. 98. 



I Vt tl\AJ . 



^t'-nvOAvJ. 





96. 



Pig. embryo 8 inm., loiigitu(lin;il vertical section. 



irtto two categories : (1) {Somatic^ a continuation of the 

 anterior column of the spinal cord, innervating somatic 

 muscles — Ilird (external ocular muscles), IVth, Vlth, Vllth 

 (part which arises from the YIth nucleus), Xllth. (2a) 

 Non-gauglionated splanchnic, a continuation of the 

 lateral column of the spinal cord, innervating voluntary 

 splanchnic muscles — Vth (motor descending root), Vth 

 (motor), Vllth, IKth, Xth, Xlth (part which arises from 

 lateral horn). (2b) Ganglionated splanchnic, a con- 

 tinuation of Clarke's column— Ilird (G. ciliare), Vllth (N. 



