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Type: Artigo de periódico
Title: Sperm Ultrastructure And Spermatogenesis In The Lizard, Tropidurus Itambere.
Author: Ferreira, Adelina
Dolder, Heidi
Abstract: Spermatogenesis, with emphasis on spermiogenesis, is described for the lizard, Tropidurus itambere, using light microscopy, phase contrast and epifluorescence, as well as scanning and transmission electron microscopy. Cellular differentiation involves events of chromatin condensation, nuclear elongation and the formation of structural complexes, such as the acrosomal and axonemal ones. Other new characteristics, exclusive for this species, include various aspects of the subacrosomal granule, the insertion of the pro-acrosomal vesicle and the development of these structures to participate in the acrosomal complex. Radial projections occurjust above the nuclear shoulders, which have been recognized already from the beginning of cellular elongation. The development of the midpiece, the dense bodies, formation of the flagellum and elimination of residual cytoplasm result in the final characterization of the mature spermatozoon. Comparisons between Tropiduridae and other lizard families are made.
Subject: Acrosome
Cell Nucleus
Microscopy, Electron
Microscopy, Electron, Scanning
Seminiferous Tubules
Sertoli Cells
Rights: aberto
Identifier DOI: 
Date Issue: 2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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