Comparative investigations on hippocampus in insectivores and primates.

Bibliographic Collection: 
MOCA Reference, APE
Publication Type: Journal Article
Authors: Stephan, H; Manolescu, J
Year of Publication: 1980
Journal: Z Mikrosk Anat Forsch
Volume: 94
Issue: 6
Pagination: 1025-50
Date Published: 1980
Publication Language: eng
ISSN: 0044-3107
Keywords: Animals, Hippocampus, Humans, Insectivora, Primates, Strepsirhini

Quantitative investigations on the hippocampus and its components from insectivores through lower to higher primates show a marked enlargement of area CA 1 of the retrocommissural hippocampus. In man, the retrocommissural hippocampus as a whole has an allometric enlargement of 3.5 times that of the lower insectivores of equal body weight. The allometric enlargement of area CA 1 is much greater (6.6 times) than that of all other components (1.6 to 3.3 times). The marked enlargement of CA 1 is accompanied by clear histomorphological alterations, the most striking of which is an obvious migration of the CA 1 pyramidal cells into the stratum oriens in the direction of the alveus. This migration of cells is considered to be caused by neurobiotaxic influences from the afferent alvear system which thus appears to be more important in higher primates. In contrast, the small praecommissural hippocampus (0.5 to 7% of the total hippocampus) is reduced. The possible relationship of this structure to olfaction is discussed.

Alternate Journal: Z Mikrosk Anat Forsch
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