. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. 172 ANATOMY OF THE CENTRAL NEEYOUS SYSTEM. divides into two parts: one bundle going to the Ggl. habennlse,—Tr, Cortico-liahenularis,—and anpther one to the Corpus mamillare on the base of the hypothalamus,—Tr. cortico-mamillaris (see Fig. 100). The latter, especially, is a well defined bundle easily followed in its course, long known in mammals as the Fornix column. In birds it is very thin. In birds and reptiles the fornix passes in a rather straight course from its origin t
. The anatomy of the central nervous system of man and of vertebrates in general. Neuroanatomy; Central Nervous System. 172 ANATOMY OF THE CENTRAL NEEYOUS SYSTEM. divides into two parts: one bundle going to the Ggl. habennlse,—Tr, Cortico-liahenularis,—and anpther one to the Corpus mamillare on the base of the hypothalamus,—Tr. cortico-mamillaris (see Fig. 100). The latter, especially, is a well defined bundle easily followed in its course, long known in mammals as the Fornix column. In birds it is very thin. In birds and reptiles the fornix passes in a rather straight course from its origin to it& terminus. But in mammals, where, through the gTeat development of the mantle, the olfactory cortex recedes far to the posterior and in part bends- ventrally (Figs. 132, 133, and 143), the Tr. cortico-mamillaris must follow Medio-dors. cortex. Ammon's horn Eiiistriatum Post, end of septum fimbria Fiss. arcuat. septi Plexus ehorioid. Tsenia Tr. thalamo-mamill. Tr. olf. habenul. Fornix Tr. strio-tlialamicus Tr. septo-mesencephalicus. Fig. 120.—Frontal section through the posterior cerebral portion of the giant snake: Python bivittahis. Dorsal, the mantle; ventral, the transitional region of the Thalamus. the margin of the hemisphere and run a rather long arcuate course before it can turn down to the corpus mamillare Just behind the commissura; anterior. Besides the Fornix system the olfactory cortex is characterized by a commissural system which connects the right side with the left. It* bundles are designated as Commissura ant. and post, pallii. In mammals^ the whole complex is called the Psalterium. In the lowest orders of mam- mals it forms the only mantle commissure; in the higher orders there is a second commissure, the Corpus callosuin. The latter connects mantle-areas- which do not belong to the olfactory apparatus, and is usually, especially in man, much larger than the commissures of the olfactory mantle, Please note that these images are extra
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