The anatomy of the nervous system, from the standpoint of development and function . itute the hippocampal com-missure. This part of the fornix, because of its resemblance to a harp, wasformerly known as the psalterium (Fig. 184). The hippocampal commissure 272 THE NERVOUS SYSTEM is not very evident in the human brain, but can be easily dissected out in thesheep (Fig. 204). The coin nunc J or n iris are round fascicles which can be traced ventrally inan arched course to the mammillary bodies (Figs. 203-205). They are placedon either side of the median plane. Each consists of an initial free po
The anatomy of the nervous system, from the standpoint of development and function . itute the hippocampal com-missure. This part of the fornix, because of its resemblance to a harp, wasformerly known as the psalterium (Fig. 184). The hippocampal commissure 272 THE NERVOUS SYSTEM is not very evident in the human brain, but can be easily dissected out in thesheep (Fig. 204). The coin nunc J or n iris are round fascicles which can be traced ventrally inan arched course to the mammillary bodies (Figs. 203-205). They are placedon either side of the median plane. Each consists of an initial free portion,which forms the rostral boundary of the interventricular foramen, and a cov-ered part, which runs through the gray matter in the lateral wall of the thirdventricle to reach the mammillary body (Figs. 204, 205). The relations of the fornix are well shown in Figs. 155, 200, and 205. Thebody of the fornix intervenes between the corpus callosum, septum pellucidum, Body of corpus callosum Lateral ventricle \ Genu of corpus callosum Body of fornix Hippocampal commissure, Thalamus. Splenium of corpus callosum_ Lateral ventricler« Chorioid fissure~ Hippocampus - Fimbria of hippo-campus-/--- Hippocampal fissure--?-— Hippocampal gyrus Dentate fasciaMammittothalamic tractMammillary bodyInfundibulumFig. 204.—Dissection of the cerebral hemisphere of the sheep to show the fornix and hippocampus. Anterior commissure Lamina lerminaHs IOptic chiasma Column of forni.\\ Median view. and cavity of the lateral ventricle on the one hand, and the transverse fissure ofthe cerebrum and the thalamus on the other. The fimbria and body of the for-nix form one boundary of the chorioid fissure. This fissure, which is shown butnot labeled in Fig. 205, represents the line along which the chorioid plexus isinvaginated into the lateral ventricle. When this plexus has been torn out,the fissure communicates with the interventricular foramen. The septum pellucidum is the thin wall which separates the tw
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