Plate XXV'I. Parasagittal section of the brain of an adult albino rat, 

 passing fully half a millimeter to one side of the median plane anteriorly 

 and a little farther from it posteriorly. X^A. 



ca, anterior commissure; cc, corpus callosum; cf, column of 

 fornix; eg, central gray matter round aqueduct of Sylvius; chd, 

 dorsal hippccampal commissure; cho, optic chiasma; chs, thin part 

 of dorsal hippocampal commissure (section lies a little too far laterad 

 to cut fornix superior); chv, ventral hippccampal commissure; ci, 

 posterior colliculus; cma, mamillary body; cpt, posterior commissure; 

 csu, anterior colliculus; ct, trapezoid body; dbc, decussation of 

 brachia conjunctiva; dp, lateral fibres of pyramidal decussation; 

 fd, fascia dentata; fhs, fasciculus hippocampo-subsplenialis; fm, 

 fasciculus retroflexus; fs, fasciculus solitarius; ge, genu of corpus 

 callosum; gVII., genu of motor root of facial nerve; h, hippocampus; 

 hi, lateral nucleus of habenula; Im, medial lemniscus; nc, neocortex 

 of cerebral hemisphere; nfs, nucleus of fasciculus solitarius; ng, 

 nucleus gracilis; ni, interpeduncular nucleus; nrm, magno-cellular 

 portion of red nucleus; nt, nucleus of trapezoid body; oi, inferior 

 olivary nucleus; p, pyramidal tract; pc, praecommissural fibre 

 system; pm, peduncle of mamillary body; po, pons; ro, rostrum of 

 corpus callosum; s, septum; sm, stria medullaris thalami; sp, 

 splenium of corpus callosum; tc, tuber cinereum; tg, mamillo- 

 tegmental tract; th, thalamus; to, tuberculum olfactorium; tro, optic 

 tract; vd'a, mamillo-thalamic tract; ve, fourth ventricle; vma, 

 anterior medullary velum; vmp, posterior medullary velum; III., 

 oculomotor nerve root; IV., decussating trochlear nerve roots; VI., 

 abducent nerve root; VII., motor root fibres of facial nerve; VIII.c, 

 chief vestibular nucleus; XII., hypoglossal nerve root. 



