. The anatomy of the domestic animals . Veterinary anatomy. 790 NERVOUS SYSTEM OF THE HORSE laterales)} The ventral surface has the reverse configuration, and presents trans- verse ridges and grooves. It forms the roof of the lateral ventricles, and the septum pellucidum is attached to it medially. The fibers of the corpus callosum (with the exception of the longitudinal striaj) run transversely and spread out laterally in all directions in the central white matter of the hemispheres to the cor- tex, forming the radiation of the corpus callosum (Radiatio corporis callosi). The fornix is a bila
. The anatomy of the domestic animals . Veterinary anatomy. 790 NERVOUS SYSTEM OF THE HORSE laterales)} The ventral surface has the reverse configuration, and presents trans- verse ridges and grooves. It forms the roof of the lateral ventricles, and the septum pellucidum is attached to it medially. The fibers of the corpus callosum (with the exception of the longitudinal striaj) run transversely and spread out laterally in all directions in the central white matter of the hemispheres to the cor- tex, forming the radiation of the corpus callosum (Radiatio corporis callosi). The fornix is a bilateral structure composed of white fibers which arch chiefly over the thalamus and the third ventricle. It is described as consisting of a body, two columns, and two crura. The body (Corpus fornicis) is formed by the fusion of the two arches of which the fornix is composed. It is triangular and overlies the an- terior parts of the thalami and the third ventricle. The dorsal surface gives. Interventricular foramen Anterior coininissure Optic Optic tract chiasm Fig. 643.—Cross-section of Brain or Horbe, About Natural Size. Section passes through optic chiasm, and is viewed from in front. 1, Longitudinal fissure; 2, septum pellu- cidum: 3, columns of fornix; 4> lateral ventricle; 5, chorioid plexus; 6, corpus meduUare (central whit^ matter) of hemisphere; 7, caudate nucleus; 5, lenticular nucleus; 5, internal capsule; iO, external capsule; J1, insula. attachment medially to the septum pellucidum, and on either side forms part of the floor of the lateral ventricle. The lateral border is related to the chorioid plexus of the lateral ventricle and forms the inner boundary of the interventricular foramen. The columns (Columnae fornicis) (Fig. 643)^ are two slender round bundles which emerge from the body in front of the interventricular foramen and diverge slightly as they curve ventrally and backward to the mammillary body. From the mammillary body the greater part of these forni
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