605 



Nerve 



Function 



Internal Origin 



Homologous internal 



Tracts in Fishes and Tiro-' 



delà 



First root of 

 IX. + X. 



IX. + X.(IX.) 



(X.a)and(X.6) 

 (X.C) 



somatic afferent 



splanchnic afferent 



splanchnic non- 

 gang, efferent 



same as (IX.) 



splanchnic non- 

 gang, efferent?, prob, 

 efferent 



Ascending and des- 

 cending dorsal tracts 



Fasciculus commu- 

 nis 



Nucleus, series B 



Nucleus, series B 

 Fasciculus solitarius 



Dorso-lateral tract in Aci- 

 petiser (7), Tuberculum 

 acusticum in Amiurus (13) 



Tract in Lobus vagi in Aci- 

 penser (7), Fasciculus com- 

 munis in Cryptohranchus 



(10) 



Motor cells corresponding 

 to ant. horn in Acipenser (7) 



The following I am inclined to believe are the homologies of the 

 branches of the dorsal VII. in Amia. 



Summary. 



The following is a summary of the principal results : 

 1 ) That while the calibre of the fibres composing the nerves often 

 affords valuable indications for tracing different tracts, there is no 

 general law whereby function can be inferred from size, e. g. — 



mainly coarse-fibred 



small with a few large fibres 



coarse 



coarse 



fine-fibred 



coarse 



partly very coarse and partly fine 



coarse 



all branches fine-fibred, including the Laryn- 

 geal to striated muscles , except those 

 branches entering the Petrohyoid, Intertrans- 

 versarius and Trapezius muscles 



