364 Undesecribed Nucleus Lateral to the Fasciculus Solitarius 
erable extent, although the cells grouped in this way resemble more 
the cells of this nucleus and the cells scattered throughout the bundles 
of the descending root of the acusticus than the very small cells gen- 
erally looked upon as the terminal nucleus of the fibres of the fas- 
ciculus solitarius in the gray substance surrounding that bundle. 
V. Kolliker* probably refers to these clumps of cells when he says: 
“In dieser Gegend ist dann auch die den Fasc. solitarius umgebende 
graue Substanz besonders entwickelt und tritt oft wie in besonderen 
Nestern auf.” 
Many writers speak of cells and gray substance as if they were quite- 
interchangeable terms, which sometimes renders their meaning doubt- 
ful. 
V. Bechterew’ refers to the nucleus described by Mayser in the 
guinea-pig as lateral to the fasciculus solitarius, but this is shown in 
Forel’s * illustration mesial to the fasciculus solitarius. . 
1Gewebelehre, 6th Ed., Vol. II, p. 243. 
2 Leitungsbahnen in Gehirn und Riickenmark. 2nd German Ed., p. 155. 
3Forel: Uber das Verhaltniss der experimentellen Atrophie- und Degenerationsme- 
thoden zur Anatomie und Histologie des Centralnervensystems. Festschrift fiir 
Nageli und Kolliker. Zurich, 1891. 
