128 The Corpus Ponto-Bulbare 
few sections farther caudally (¢.p. Fig. 8), occupies a similar position 
with regard to the restiform body. Sections like Fig. 8 might easily be 
misinterpreted as containing a dorsal cochlear nucleus. 
The caudal part embraces that portion of the ponto-bulbar body which 
sweeps around the restiform body to gain the dorsal surface of the 
medulla. As its most cephalic border is reached, the fibers are cut a little 
more obliquely indicating that they are turning out of their caudo- 
cephalic course, see Fig. 8 and Fig. 9. <A little farther backward the 
fibers run around the restiform body in a rather heavy layer (Fig. 10) ; 
the nuclear mass, on the other hand, does not follow them immediately, 
so that in sections where the front part appears, fibers alone are seen 
encircling the restiform body—c.p. Fig. 8. When the body reaches its 
greatest development, the fibers can be traced for some distance as they 
bend around the restiform body; always separated from it by a mass of 
nuclear material. It is here that the fiber bundles which skirt along the 
edge may be interspersed with thin strata of ganglion cells as in Figs. 9 
and 10. From the part of the nucleus which adjoins the median vesti- 
bular nucleus a few small strands of fine fibers could be traced as they 
ran cephalically toward one of the striz acustice, which had a caudal di- 
rection. On reaching this stria, the fibers made a sharp turn and joined 
it. Numerous other smaller groups of fibers had a similar direction and 
gave the impression of joining the striz but only one such bundle could 
be followed from the ponto-bulbar body to the strize acustice. It is prob- 
ably this connection which led Clarke to interpret this structure, which 
he undoubtedly saw, as belonging to the group of striz acustice. 
The caudal tip extends out as a tongue-like structure which projects 
to a greater or less extent into the roof of the fourth ventricle in the 
edge of the tela choroidea inferior, see Figs. 9, 10, and 11. The ventral 
side of the free process is lined by a layer of ependyma which is continu- 
ous with the ependymal cells lining the rest of the ventricular cavity, 
while the dorsal side is covered by pia mater—in every respect then it 
appears to be an enlarged portion of the secondary “ Rautenlippe” of 
His. An illustration not unlike my Fig. 9 is given by Spalteholz* in 
his figure 727. 
ure and has no label referring to it; the characteristic superficial fiber 
layer, the fusion of the cell mass with the restiform body, and even the 
Here it appears to be disregarded as an individual struct- 
“Werner Spalteholz: Hand Atlas of Human Anatomy, Vol. III, Leipsig, 
1906. 
