. Cunningham's Text-book of anatomy. Anatomy. THE CONNEXIONS OF THE OLFACTORY NEEVES. 627 Fascia dentata fissura hippocampi. There is no fissura hippocampi in the human train. What is usually described under this name is an artificial cleft made by pushing the handle of a scalpel into the hippocampal formation at the edge of the exposed part of the fascia dentata (Fig. 556, B and 0, at x) and separating the morpho- logical surface of the hippocampus from that of the buried part of the fascia dentata. Cleavage readily occurs along this line because there are numerous nerve-fibres, hippocampal a
. Cunningham's Text-book of anatomy. Anatomy. THE CONNEXIONS OF THE OLFACTORY NEEVES. 627 Fascia dentata fissura hippocampi. There is no fissura hippocampi in the human train. What is usually described under this name is an artificial cleft made by pushing the handle of a scalpel into the hippocampal formation at the edge of the exposed part of the fascia dentata (Fig. 556, B and 0, at x) and separating the morpho- logical surface of the hippocampus from that of the buried part of the fascia dentata. Cleavage readily occurs along this line because there are numerous nerve-fibres, hippocampal and dentate respectively, upon each side of it. As development proceeds a break occurs in the cell-column at the junction of its ⢠hippocampal and dentate parts, and the two columns (Fig. 556, C) become partially interlocked. â *- mi r> , i t ⢠Fimbria hippocampi The axons ol the hippo- campal cells collect upon its ventricular surface to form the alveus, the fibres of which converge towards the margin of the fascia Hippocampal. dentata, where they bend into the longitudinal direc- tion ( parallel to the edge of the pallium and the lamina chorioidea) to form a prominent white marginal fringe, the fimbria. The fibres of the fimbria pass upwards and forwards (Fig. 555), and ultimately reach the upper end of the lamina terminalis, which provides a bridge to conduct a certain number of them across the median plane into the fornix or Corpus callosum. commissure --£â * Anterior commissure -'-'«" Paraterminal body " " Lamina terminalis " Olfactory bulb / Optic chiasma Column of fornix Fig. 555. -Medial Aspect of the Right Cerebral Hemisphere of a Human Fcetus of the Fourth Month. The broken red lines indicate tlie paths taken by callosal fibres in the neopallium to reach the upper end of the lamina terminalis. Neopallium. J Neopallium " ⢠-»' â â¢. Alveus. yj Hippocampus. Plex chorioideus Plexus chorioideus Plexus chor
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