Abstract
Using histochemical stain for acetylcholinesterase (AChE), the lateral posterior pulvinar complex (LP-P) was analyzed in kittens aged 0–123 postnatal days and in adult cats. In the lateral nucleus of the complex (LPl) of kittens aged 4–21 days, a transient clustered AChE staining of neuropil was revealed. The average size of AChE clusters varied between 200 and 300 mkm; the inter-cluster distance varied between 430 and 600 mkm. Optical contrast of clusters increased rapidly from the 4th to the 14th postnatal day and, thereafter, rapidly decreased up to the 21st-28th postnatal day. Since AChE is directly linked to neuronal differentiation and development and AChE clusters are located in the same area with neurons responsible for thalamocortical connections, the transient clusters of AChE expression could be related to the development of visual structures.
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