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Université de Fribourg

Quantitative analysis of postnatal neurogenesis and neuron number in the macaque monkey dentate gyrus

Jabès, Adeline ; Banta Lavenex, Pamela A. ; Amaral, David G. ; Lavenex, Pierre

In: European Journal of Neuroscience, 2010, vol. 31, no. 2, p. 273-285

The dentate gyrus is one of only two regions of the mammalian brain where substantial neurogenesis occurs postnatally. However, detailed quantitative information about the postnatal structural maturation of the primate dentate gyrus is meager. We performed design-based, stereological studies of neuron number and size, and volume of the dentate gyrus layers in rhesus macaque monkeys (Macaca...

Université de Fribourg

Intrinsic connections of the macaque monkey hippocampal formation: II. CA3 connections

Kondo, Hideki ; Lavenex, Pierre ; Amaral, David G.

In: The Journal of Comparative Neurology, 2009, vol. 515, no. 3, p. 349 - 377

We examined the topographic organization of the connections of the CA3 field of the macaque monkey hippocampus. Discrete anterograde and retrograde tracer injections were made at various positions within CA3 and CA1. The projections from CA3 to CA1 (Schaffer collaterals), which terminate in the strata radiatum, pyramidale, and oriens, are present throughout the entire transverse extent of CA1....

Université de Fribourg

Postmortem changes in the neuroanatomical characteristics of the primate brain: Hippocampal formation

Lavenex, Pierre ; Lavenex, Pamela Banta ; Bennett, Jeffrey L. ; Amaral, David G.

In: The Journal of Comparative Neurology, 2009, vol. 512, no. 1, p. 27 - 51

Comparative studies of the structural organization of the brain are fundamental to our understanding of human brain function. However, whereas brains of experimental animals are fixed by perfusion of a fixative through the vasculature, human or ape brains are fixed by immersion after varying postmortem intervals. Although differential treatments might affect the fundamental characteristics of the...

Université de Fribourg

Intrinsic connections of the macaque monkey hippocampal formation: I. Dentate gyrus

Kondo, Hideki ; Lavenex, Pierre ; Amaral, David G.

In: The Journal of Comparative Neurology, 2008, vol. 511, no. 4, p. 497 - 520

We have carried out a detailed analysis of the intrinsic connectivity of the Macaca fascicularis monkey hippocampal formation. Here we report findings on the topographical organization of the major connections of the dentate gyrus. Localized anterograde tracer injections were made at various rostrocaudal levels of the dentate gyrus, and we investigated the three-dimensional organization of the...