A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . e gyrus ambiens and thegyrus semilunaris of the uncus. Fromtliese centers the hippocampus is con-tinued dorsaUj around tlie posterior marginof the embryonic hemisphere (buried withinthe substance of the temporal lobe in theadult) to the medial surface. On themedial surface the hippocampus is sepa-rated from the neopallium by the fissuraarcuata (Fig. 9.^5), the posterior part ofwhich in the advilt becomes the fissura hip-pocampi. In some lower mammals, where the rhi
A reference handbook of the medical sciences, embracing the entire range of scientific and practical medicine and allied science . e gyrus ambiens and thegyrus semilunaris of the uncus. Fromtliese centers the hippocampus is con-tinued dorsaUj around tlie posterior marginof the embryonic hemisphere (buried withinthe substance of the temporal lobe in theadult) to the medial surface. On themedial surface the hippocampus is sepa-rated from the neopallium by the fissuraarcuata (Fig. 9.^5), the posterior part ofwhich in the advilt becomes the fissura hip-pocampi. In some lower mammals, where the rhi-ncncephalon is more highly developed tlianin man and where the corpus callosum isabsent, this fissure is in tlie adult con- tinued forward into the position of the embryonicfissura prima, and the hippocampus extends forwardinto contact with the olfactory nuclei of the of Fig. 9,j7 with Fig. shows that inthe adult marsupial (opossum, kangaroo, etc.), thehippocampal fissure is the c^iuivalent of the fissuraarcuata and the fissura prima and that in the mar-supial the hippocampus (fascia dentata) is con-. FlG. 960.—Scheme similar to Fig. 959 of the CorrespondingRegion of a more Highly De\eloped Cerebrum, Such as that ofthe Bat, Pteropus. Reference letters as before, and in addition;, commissura hippocampi; , fissura hippocampi; fix.,the subsplenial hippocampal flexure; spl., splenium corporiscaUosi; * g>rus subsplenialis (Le\i) or gjTUs Andreie Retzii.(After EUiot Smith). tinuous from the septum in front to the pyriformlobe around the posterolateral border of the the marsupials the anterior commissure (, comm. v.) is very large and the hippocampalcommissure {comm. d.) is also well developed, butthere is no corpus callosum. The relations of thehippocampus in a marsupial brain are shown sche-matically in Fig. 959, where the hippocampus is seento be composed of a postcommissural portion (fd.),a supracommissural portion {hip.) and
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Keywords: ., bookauthorbuckalbe, bookcentury1900, bookdecade1910, bookyear1913