MOTOR NUCLEI IN PHYLOGENY a5) 
scription, Furbringer’s term ‘occipito-spinal’ has been used in 
its broadest sense.'’ 
In teleosts, unlike selachians, the rostral termination of the 
occipito-spinal motor column, is rounded and blunt, so that in 
transverse section the distribution of the motor cells in this 
nucleus closely resembles the arrangement obtaining in the 
anterior horn of the cord (figs. 26, 29, 40 A and 41 A). 
Gals, - ,Lobwvag. 
Re i aa 
OE gs St 
SoS 3 a Nu.Xm. 
rr y : 2 - 4 
aS QS se 
Nu.occ.sp.m. dors.. 59, *38 
Nu.occ.sp.m.vent.--*e» 2+ 
Soe a | 
3G 
__.-Fib.arc.dors. 
Fig. 26 Solea vulgaris. Transverse section of brain stem just caudad of 
the calamus. 
Fig. 27. Transverse section of brain stem somewhat rostrad of the preceding 
at the exit level of a motor vagus rootlet. Abbreviations: C.c., crista cerebel- 
laris; Fib.arc.dors., dorsal arcuate fibers; Fib.arc.int., internal arcuate fibers 
from funicular area, vagal lobes and motor vagal nuclei; F.d.l., fasciculus dorso- 
lateralis; F.I.l., fasciculus longitudinalis lateralis; F.l.m., fasciculus longitu- 
dinalis medialis; Lob.vag., visceral sensory column; Nu.fun., nucleus of funicular 
area; Nu.occ.sp.m.dors., dorsal moiety of motor occipito-spinal nucleus; 
Nu.oce.sp.m.vent., ventral moiety of motor occipito-spinal nucleus; Nu.X.m., 
motor vagal nucleus; R.desc.V., tractus spinalis trigemini; R.X., vagus root; 
R.X.m., motor vagus rootlet; T'r.tc.b.cruc., tractus tecto-bulbaris cruciatus; 
Tr.tc.b.rec., tractus tecto-bulbaris rectus; Tr.sec.com., secondary gustatory 
bundle; Tub.ac., tuberculum acusticum. 
13 In his earlier works Dr. Kappers has used the term spino-occipital to de- 
scribe this region in teleosts, but the present change in usage has been under- 
taken on the advice of this author. It is to be recalled that Furbringer applied 
the term ‘occipito-spinal’ to those nerves (viz., a, b, and c) which had only in- 
completely lost their spinal character and which issued from the cranio-spinal 
canal rostral to the first true spinal (Furbringer’s spinal nerve 4) and caudal 
to the protometameric portion of the cranium. 
