288 MR. J. L. CLARKE OK THE INTIMATE STRUCTURE OF THE BRAIN. 
sulcus of the ventricle, I found that on reaching the median sulcus its fibres sank into the 
medulla, and then ran at a right angle from behind forward down the corresponding 
lateral half of the raphe, as represented at K, fig. 42, Plate XII. On tracing the fibres 
from this point backward and outward, they were seen to pass through and on each side 
of the oval group of cells (T), constituting, as already described, the inner portion of the 
“ fasciculus teres f and then to wind over the outer column (K') of that fasciculus, and 
over the auditory nuclei (i and c o') as far as Q Q', where they were closely united to the 
auditory nerve (P). The restiform body (c) was enclosed by both the stria and the nerve. 
g represents the uppermost fibres of the glossopharyngeal nerve. Some of them in their 
passage beneath the restiform body (<?) turn round to e, e, e, e, the cut ends of the 
descending portion of the fifth nerve in the grey tubercle or caput cornu posterioris ; 
others go to the slender longitudinal column (n), and the rest to the group of cells (H), 
which constitutes the chief nucleus of the nerve, and is continuous with the column of 
cells that belongs to the vagal nucleus. U is the lower end of the column of cells 
forming the nucleus of the motor root of the trigeminus, and S is a network containing 
several large multipolar cells, with intervening longitudinal bundles of fibres, beneath 
the “ fasciculus teres f and in the place where the hypoglossal nucleus ended. Fig. 40, 
Plate XI. represents another transverse section of the fourth ventricle a little lower 
down than the one just described, but passing through one of the striae. In this case, 
however, the stria, instead of running in a straight line across the ventricle, curved 
downward as it approached the median sulcus, and was therefore divided obliquely at 
different parts of its course, as seen at QQ'. On examining the section, and then com- 
paring it with the cut surface of the ventricle from which it was taken, and which con- 
tained the remainder of the stria, it was not difficult to see that the fibres had different 
destinations. On reaching the median sulcus, the stria partially divided into two branches. 
One of these (at Q') ran transversely forward through the oval group of cells (T), espe- 
cially through its inner and outer sides, and then passed into the raphe as in the former 
case. The other branch turned longitudinally downward over and through the posterior 
part of the oval group (T). The cut ends of its fibres are represented by the dark spots 
at the extremity of the line (T) on the left side. It is most probable that these fibres, 
after running for different distances downward, pass, like the others, transversely forward 
through the vesicular column (T), and thence into the raphe. 
(34) There can be no doubt whatever that many of the striae medullares connect both 
the portio mollis and the auditory nucleus with other parts of the medulla and brain. 
Fig. 41, Plate XI. represents the side and under surface of one lateral half of the pons 
Varolii and medulla oblongata. W is the pons, y is the anterior pyramid; w the 
olivary body ; X the portio dura or facial nerve ; c the restiform body ; Y the cut 
surface of the middle and inferior peduncles of the cerebellum ; Z is the auditory nerve 
turned backward over the restiform body ; Z ' the cut end of the fifth nerve. The large 
hand of fibres proceeding out of the fourth ventricle, and turning round the restiform 
body at Z", are seen to lie close against the roots of the auditory nerve (Z), as they pass 
