Journal of Morphological Sciences
http://www.jms.periodikos.com.br/article/587cb44b7f8c9d0d058b45be
Journal of Morphological Sciences
Original Article

ULTRASTRUCTURE OF THE RAT SUBLINGUAL GLAND DURING PERIOD OF HIGH PROLIFERATIVE ACTIVITY IN POSTNATAL DEVELOPMENT

Rumio Taga; Antonio Sesso

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Abstract

The postnatal development of the rat sublingual gland was studied using autoradiography and electron microscopy. The labeling indices of parenchymal and stromal cells were determined in autoradiographs from rats injected with 3H-thymidine. The labeling index of parenchymal cells remained high from the second to the twentieth day after birth, but declined significantly thereafter. Ultrastructural analysis showed that during the period of high proliferative activity the secretory cells had an ultrastructure that was qualitatively similar to that of cells from the glands of old rats, but were still immature. Only after day 20 did these cells show large amounts of rough endoplasmic reticulum and secretory granules that reached the adult pattern 30 days after birth. Maturation of the myoepithelial cells occurred during the same period.

Keywords

Development, sublingual gland, ultrastructure, proliferation, rat
587cb44b7f8c9d0d058b45be jms Articles
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J. Morphol. Sci.

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