Publication: Postnatal maturation of the parenchymal
cell types in the rabbit pineal gland
Authors
García-Mauriño, J.E. ; Boya, J.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
An ultrastructural study on the maturation
of the parenchymal rabbit pineal cell types from the
first postnatal day up to 120 days is presented. Two
main cell types are distinguished from the first 24h of
postnatal life. Pinealocytes of the types 1 and 11 display
different developmental degrees. Both immature cell
types are arranged in groups. In addition, type 11
pinealocytes form rosette-like structures. Both cell
types progressively become isolated and display cell
processes. The nucleus and the cytoplasm of type 1
pinealocytes are barely electrondense. During the
postnatal period, the number of cytoplasmic
organelles, cell processes and terminal clubs increase
progressively. Terminal clubs are frequently seen near
blood vessels. After 30 days, type 1 pinealocytes show
characteristics of adult pinealocytes. However, the
maturation of rnost type 1 pinealocytes does not
complete until the 90th postnatal day. Type 11
pinealocytes present a fairly electrondense nucleus and
cytoplasm. Mature forms can be seen after the 5th
postnatal day. During the postnatal period, a close
relationship is determined arnong type 11 pinealocytes
and cell processes and terminal clubs of type 1
pinealocytes.
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