. The anatomy of the domestic animals. Veterinary anatomy. THE CEREBRAL HEMISPHERES 791 the posterior angles of the body. Each curves outward and backward over the thalamus (from which it is separated by the tela chorioidea), and is chiefly continued as the fimbria along the concave border of the hippocampus. The crura give off fibers to form the alveus, a layer of white matter which covers the ventricular face of the hippocampi, and between them are transverse fibers which constitute the hippocampal commissure (Commissura hippocampi). The septum pellucidimi is the median partition between the
. The anatomy of the domestic animals. Veterinary anatomy. THE CEREBRAL HEMISPHERES 791 the posterior angles of the body. Each curves outward and backward over the thalamus (from which it is separated by the tela chorioidea), and is chiefly continued as the fimbria along the concave border of the hippocampus. The crura give off fibers to form the alveus, a layer of white matter which covers the ventricular face of the hippocampi, and between them are transverse fibers which constitute the hippocampal commissure (Commissura hippocampi). The septum pellucidimi is the median partition between the two lateral ven- tricles. Its convex dorsal border blends with the corpus callosum and its concave ventral border joins the fornix. Its anterior part is received into the genu of the corpus callosum. Traced backward, it diminishes in height and the two edges meet at an acute angle at the spleniuin. The septum consists of two layers (Laminae septi pellucidi) which are in contact with each other. They consist of medullated nerve-fibers and gray matter. The latter exists in considerable amount in the thicker part of the septum adjacent to the columns of the fornix. Many of the fibers of the .septum up through the corpus callosum to the gyrus fornicatus. Others are connected with the subcallosal gyrus and the parolfactory Fig. 644.—Sagittal Sectiom of Brain of Hor-se. Section is cut about cm. to the right of the median plane. M, Medulla oblongata; P, pons; (above AT), chorioid plexus of fourth ventricle; Cm., central white matter (corpus medullare) of cerebellum and of cerebrum: (in front of P), cerebral peduncle; H, hippocampus: V, lateral ventricle; T, thalamus; , caudate nucleus; a., internal capsule; , lenticular nucleus; , olfactory bulb. The lateral ventricle (Ventriculus lateralis cerebri) is the irregular cavity in the interior of each cerebral hemisphere.^ Each communicates with the third ventricle through the interventricular fora
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