ON A HITHERTO UNDESCRIBED NUCLEUS LATERAL TO 
THE FASCICULUS SOLITARIUS. 
BY 
E. LINDON MELLUS, M. D. 
From the Anatomical Laboratory of the Johns Hopkins University. 
WitTH 3 TEXT FIGURES. 
In the medulla of the dog there is a collection of large nerve cells 
lateral to the fasciculus solitarius (spimal root of the vago-glosso- 
pharyngeus nerve) sufficiently well-defined to merit attention as a 
separate nucleus. This nucleug has not, to my knowledge, been pre- 
viously described. The cells are large, round, oval or pear-shaped, of 
20-40 40-80 » in size and stain more deeply with carmine than any 
of the other cells in the im- 
mediate neighborhood. 'They 
extend upward from the level 
of the calamus — scriptorius 
something more than 2 mm. 
The cells are somewhat scat- 
tered, the number in each sec- 
tion (50 yp thick) varying 
from one to eight upon either 
side. In an occasional section 
they may be entirely absent. 
In an unbroken set of serial 
sections | was able to count 
130 cells upon one side and 
160 upon the other. At this 
level the gray substance par-  Fy@.1. Outline of cross-section through medulla 
tially surrounding the fasci- Ne auetodciNeniel Pas auelecs ine clube” 
Biuswsolitaniua doas aon ag eee le nee aa eondee eaeeeae 
parently extend to its lateral Gi. aibetantia palatinosas O.lty eorvus rectors? 
ae eee Fe FC Sie VIII. N. R. D., radix descendens nervi vestibuli; 
aspect, but the section is some- XII. N., nervus hypoglossus; F.S., fase. solitarius; 
; 7. nucl sribed in thi ; 
what lighter here owing to a "7 ™C°"S eee eee ae eal 
less compact matt of myelinated fibres. The large cells of this nucleus 
are scattered about in this network of fibres, some lying quite close to the 
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