The anatomy of the nervous system, from the standpoint of development and function . few nerve-cells which for the most part belong to Golgis Type Layer of Pyramidal Cells.—The pyramidal cells are all of medium sizeand their fusiform bodies are rather closely packed together, forming a well- THE 79 defined zone, the stratum lucidum. Their apical dendrites are dire* led towardthe molecular layer and form the chief constituent of the stratum axons of these cells, after giving off collaterals, enter the alveus. The layer of polymorphic cells, also known as the
The anatomy of the nervous system, from the standpoint of development and function . few nerve-cells which for the most part belong to Golgis Type Layer of Pyramidal Cells.—The pyramidal cells are all of medium sizeand their fusiform bodies are rather closely packed together, forming a well- THE 79 defined zone, the stratum lucidum. Their apical dendrites are dire* led towardthe molecular layer and form the chief constituent of the stratum axons of these cells, after giving off collaterals, enter the alveus. The layer of polymorphic cells, also known as the stratum oriens, containscells of Martinotti, that send their axons into the molecular layer, and :-,till othercells the axons of which enter the alveus. The alveus is a thin white stratum which separates the preceding layer fromthe ventricle. It is continuous, on the one hand, with the white center of the AlveusLayer of polymorphic cells Laver of pyramidal cells, Stratum lucidum\ Stratum radia- tum . Molecular layeri Stratum lacunosumTangential fibers Lateral ventricle Fimbria. Fascia denlata Subiculum Granule layer ? Layer of polymorphic cells Fig. 210.—Diagram of the structure and connections of the hippocampus. The arrowsshow the direction of conduction: A, molecular layer, and B, pyramidal cell layer of the subic-ulum; F, hippocampal fissure. (Cajal.) hippocampal gyrus, and on the other with the fimbria. Through it the efferentfibers of the hippocampus enter the fimbria and fornix. The fibers of the hippo-campal commissure are also carried in the fimbria and enter the hippocampusthrough the alveus. The fascia dentata also belongs to the archipallium and is closely related tothe hippocampus, which it resembles somewhat in the structure of its threestrata: the molecular layer, granule layer, and layer of polymorphic cells (). The granules may be regarded as modified pyramidal cells of small size,ovoid or fusiform in shape. Each possesses instead of a single apical
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
