. Anatomy of the cat. Cats; Mammals. THB CENTRAL NERVOUS SYSTEM. Z^l ventricles of the brain, whence the application of the names third and fourtJi ventricles to the cavities of the 'tween-brain and hindbrain. The lateral ventricles do not grow at the same rate as the walls of the hemispheres, so that they remain com- paratively small. The cavity of each ventricle is further reduced in size by the development on its floor of a large ridge-like thickening, the corpus striatum (Fig. 148,/). The dorsal wall or roof of the lateral ventricle joins the thin roof of the third ventricle on each side a
. Anatomy of the cat. Cats; Mammals. THB CENTRAL NERVOUS SYSTEM. Z^l ventricles of the brain, whence the application of the names third and fourtJi ventricles to the cavities of the 'tween-brain and hindbrain. The lateral ventricles do not grow at the same rate as the walls of the hemispheres, so that they remain com- paratively small. The cavity of each ventricle is further reduced in size by the development on its floor of a large ridge-like thickening, the corpus striatum (Fig. 148,/). The dorsal wall or roof of the lateral ventricle joins the thin roof of the third ventricle on each side along an oblique curved line (Fig. 141, 1) which follows the cranial or lateral border of the thalamus (Fig. 141, /). Along this line the thin roof of the brain is folded in together with the pia mater to form the choroid plexus of the lateral ventricles (lamina chorioidea epithelialis) (Pig. 148, c). When this is pulled out there is left a fissure, the "great transverse fissure of the cerebrum " (Fig. 141, 1). Just dorsad of the groove between the thalami there runs a tract of white fibres known as the fornix (Fig. 148, a). The two halves of the fornix separate at the cranial ends of the tha- lami and pass ventrad, forming thus the pillars of the fornix (Fig. 148, b\ Pig. 14^,7'). Dorsad of the cranial end of the tt, , . , .p r- ^-" ' Fig. 147. — The Corpus fornix the corpus callosum (Pig. 143,/) Callosum. passes from one hemisphere to the other. , The dorsal portion of the * '^ _ hemispheres has been dis- Caudad of the pillars of the fornix, the sected away, then shced off, lateral ventricles communicate with the t^;^^^^'^^ ^Y"" "^ '"""T verse fibres fornung tlie third ventricle by way of the interven- corpus callosum. a, spleni- ,.,/. /-- r-RT \ \vn\\ b, genu; f, line marking tncular foramen (foramen of Monro). the medial edge of the hemi- The parts of the cerebrum may now spheres; d, line marking the , . 1 •! lateral boundary
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Keywords: ., bookcentury1900, bookleafnum, booksubjectcats, booksubjectmammals
