326 ME. J. L. CLAEKE ON THE INTIMATE STEITCTITEE OF THE BEAIN. 
shown at n", fig. 5, and coming from the postpyramidal and restiform nuclei 
to decussate into the anterior pyramids. 
Fig. 28. Left lateral half of the grey substance of the medulla, a little below fig. 5, and 
where the lower roots ( r ) of the spinal-accessory nerve begin : — t , lower end of 
the special nucleus of the upper roots of the nerve ; t', lower end of the special 
nucleus of the upper roots of the hypoglossal nerve, at the side-front of the 
canal ; x, lower hypoglossal roots arising from a group of cells in the remains 
of the anterior cornu, f ; o, restiform nucleus ; b', postpyramidal nucleus. On 
the left of t f are seen the last traces of the curved bundles of fibres which 
the anterior pyramids in their course downward send into the posterior grey 
substance (see n", fig. 5). 
Fig. 29. Transverse section of the grey substance of the lowest end of the medulla 
oblongata at the point of the anterior pyramids : — e", posterior roots of first 
cervical nerves extending forward into the antero-lateral grey substance, to 
the part where the lowest fibres (/') of the anterior pyramids are connected 
with it. The same part is also connected with the lower roots of the spinal- 
accessory nerve ( r ), which is seen to traverse the lateral grey substance and 
reach the anterior cornu. 
Fig. 30. Longitudinal section of part of the human medulla: — t", glossopharyngeal 
nucleus ; n n, slender longitudinal column ; g, roots of the glossopharyngeal 
nerve running partly longitudinally along this column ; i, the inner auditory 
nucleus. 
Fig. 31. Longitudinal and horizontal section along the floor of - the fourth ventricle, at 
the dotted line, fig. 32, through the hypoglossal nucleus (J), the vagus nucleus 
(H, H'), and the slender longitudinal column (n). From the large multipolar 
cells of the hypoglossal nucleus (J, J", fig. 31), numerous processes extend 
outward, between longitudinal bundles of fibres, into the inner and outer 
portions (H, H') of the vagus nucleus, n is the slender column of longitudinal 
fibres, continuous with some of the transverse fibres of the vagus nucleus. 
PLATE XI. 
Fig. 33. Transverse section of the medulla oblongata of the Cod-fish, at the point of the 
calamus scriptorius : — 1, 1, the anterior portion of the medulla; 2, 2, cut-ends 
of large bundles of fibres at its surface ; 3, group of large multipolar cells in 
its centre ; 4, cut-end of column of longitudinal fibres in front of the canal, 6 * 
5, large group of multipolar cells at the side and front of the canal ; 7, fibres 
radiating from it to the surface (on left side) ; 8, lower root of vagus 
nerve arising from it, and joining the other root, 9, which arises from the 
inner and posterior part of the medulla (10, 10) at the side and behind the 
canal. The group of cells (5) occupies the position of the hypoglossal nucleus 
