. The anatomy of the domestic animals. Veterinary anatomy. THE CEHEBR.\L HEMISPHERES 787 band of white matter, termed the fimbria, which is the prolongation of the greater part of the crus of the fornix into this region. The ventricular surface of the hippocampus (Fig. 642) is covered with a thin laj'er of white matter, the alveus, wliich is also derived from the crus of the fornix, and is therefore continuous with the fimbria. The two hippocampi are connected at their highest parts by trans- verse fibers which constitute the hippocampal commissure. The interval between the liippocanipus and f
. The anatomy of the domestic animals. Veterinary anatomy. THE CEHEBR.\L HEMISPHERES 787 band of white matter, termed the fimbria, which is the prolongation of the greater part of the crus of the fornix into this region. The ventricular surface of the hippocampus (Fig. 642) is covered with a thin laj'er of white matter, the alveus, wliich is also derived from the crus of the fornix, and is therefore continuous with the fimbria. The two hippocampi are connected at their highest parts by trans- verse fibers which constitute the hippocampal commissure. The interval between the liippocanipus and findiria 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. This 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 fornical Siiblimbic fissure (ant. part) Transverse fissure Cutloso-niarginal fissure Sublimbic fissure {post, part) / I'.ntomarginal fissure Marginal fissure. Sulcus rhivalis anterior Ectomarginnl Jissure Hippocampal fissure g^i^^ rhinalis posterior Fig. 640.—Medio-ventral Aspect of Right C The olfactory bulb is cut off. , Olfactorj- tract; , optic tract; Co., chiasraa opticum; , subcallosal gy OF Horse. L parolfactoria; , trigonum olfactorimn; corpus callosum; , septum pellucidum; F, foriux; F\ fimbria; , callosal gyrus; , hippocampal gj-rus. r, cut surface of thalamus; , gyrus dentatus; , piriform lobe; of the lateral ventricles, where they form thick, rounded bands containing convolu- tions of blood-vessels, known as the chorioid plexuses of the lateral ventricles
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectveterinaryanatomy
