. The anatomy of the domestic animals . Veterinary anatomy. THE CEBEBIIAL HEMISPHERES 787 mrt of 7h "^^ttf' te^ed the fimbria, which is the prolongation of the greater part of the crus of the fornix mto this region. The ventricular surface of the hippocampus (Fig. 642) is covered with a thin layer of white matter, the alveus, which IS also derived from the crus of the fornix, and is therefore continuous with the limbria. The two hippocampi are connected at their highest parts by trans- verse fibers which constitute the hippocampal commissure. The interval between the hippocampus and fimbr
. The anatomy of the domestic animals . Veterinary anatomy. THE CEBEBIIAL HEMISPHERES 787 mrt of 7h "^^ttf' te^ed the fimbria, which is the prolongation of the greater part of the crus of the fornix mto this region. The ventricular surface of the hippocampus (Fig. 642) is covered with a thin layer of white matter, the alveus, which IS also derived from the crus of the fornix, and is therefore continuous with the limbria. The two hippocampi are connected at their highest parts by trans- verse fibers which constitute the hippocampal commissure. The interval between the hippocampus and fimbria on the one hand, and the brain stem_ on the other, is a lateral continuation of the transverse fissure of the brain, and is occupied by a fold of pia mater, the tela chorioidea of the third ven- tricle, i his fold IS triangular in outline and its apex reaches to the interventricular foramen. Its base is continuous at the transverse fissure with the pia which covers the surface of the brain. Its middle part lies over the epithelial roof of the third ventricle, as has been seen (Fig. 637). The lateral borders will be seen on the floor Interventricular foramen Gyrus fornicatus Sublimbic fissure {ant. part) Transverse fissure Calloso-inarginal fissure Siibliminc fissure (post. parC) Entomartjinal fissure Marginal fissure. Sulcus rhinnlis anterior Ertomarginal fissure Hippocampal fissure Sulcus rhinalis posterior Fig. 640.—Medio-ventral Aspect of Right Cerebral Hemisphere of Horse. The olfactory bulb is cut off. , Olfactory tract; , area parolfactoria; , trigonum olfactorium; , optic tract; Co., cfiiagma opticum; , subcallosal gyrus; , corpus callosum; , septum pellucidum; F, fornix; F', fimbria; , callosal gyrus; T, cut surface of thalamus; , gyrus dentatus; , piriform lobe; , hippocampal gyrus. of the lateral ventricles, where they form thick, rounded bands containing convolu- tions of blood-vessels, known as the chorioid plexuse
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