Spermatogenesis and sperm morphology

This study describes the revision of spermatogenesis and paraspermatogenesis process in gastropods and comparative sperm morphology in the most of the classes of Molluscs. The spermatogenesis pattern including, the nuclear condensation involved granular, fibrillar, lamellar, and final homogenous ele...

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Autor principal: Giménez, Juliana
Publicado: 2014
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816311_v_n_p49_Gimenez
http://hdl.handle.net/20.500.12110/paper_97816311_v_n_p49_Gimenez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_97816311_v_n_p49_Gimenez2023-06-08T16:38:29Z Spermatogenesis and sperm morphology Giménez, Juliana This study describes the revision of spermatogenesis and paraspermatogenesis process in gastropods and comparative sperm morphology in the most of the classes of Molluscs. The spermatogenesis pattern including, the nuclear condensation involved granular, fibrillar, lamellar, and final homogenous electrondense phases. Acrosome development starts with the posteriorly-located proacrosomal vesicle arising from the Golgi complex in euspermatids. This proacrosomal vesicle develops into a pre-attachment acrosome, which, together with the Golgi body, later moves towards the apex of the nucleus. Ultrastructural studies show that spermatozoa are useful indicators of systematic position and phylogenetical relationship within the Molluscs. The morphology of the mature sperm of Bivalves, Solenogasters, Monoplacophora, Cephalopoda and Gastropoda, given in this work, can be used to understand some aspect of the reproduction, how the shape of the sperm can be related to internal or external fertilization. Also is describes the dimorphic types of sperms in gastropods, call parasperm, and this related to the mode and the capacity of fertilization and the morphology of the parasperm also can be used as indicators of systematic position. Paraspermatogenesis is describes in gastropods and the pattern of chromatin distribution in dense patches, together with the cytoplasmatic characteristics of paraspermatogonia, allow for the recognition of the apyrene line from the euspermatogonia. Later-occurring features, including the peripheral condensation of nuclear chromatin followed by nuclear invagination, the posterior breakdown into nuclear vesicles (?caryomerites?), centriole multiplication, and the synthesis of secretory products, are the most conspicuous changes in the paraspermatogenesis process. © 2014 by Nova Science Publishers, Inc. All rights reserved. Fil:Giménez, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816311_v_n_p49_Gimenez http://hdl.handle.net/20.500.12110/paper_97816311_v_n_p49_Gimenez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description This study describes the revision of spermatogenesis and paraspermatogenesis process in gastropods and comparative sperm morphology in the most of the classes of Molluscs. The spermatogenesis pattern including, the nuclear condensation involved granular, fibrillar, lamellar, and final homogenous electrondense phases. Acrosome development starts with the posteriorly-located proacrosomal vesicle arising from the Golgi complex in euspermatids. This proacrosomal vesicle develops into a pre-attachment acrosome, which, together with the Golgi body, later moves towards the apex of the nucleus. Ultrastructural studies show that spermatozoa are useful indicators of systematic position and phylogenetical relationship within the Molluscs. The morphology of the mature sperm of Bivalves, Solenogasters, Monoplacophora, Cephalopoda and Gastropoda, given in this work, can be used to understand some aspect of the reproduction, how the shape of the sperm can be related to internal or external fertilization. Also is describes the dimorphic types of sperms in gastropods, call parasperm, and this related to the mode and the capacity of fertilization and the morphology of the parasperm also can be used as indicators of systematic position. Paraspermatogenesis is describes in gastropods and the pattern of chromatin distribution in dense patches, together with the cytoplasmatic characteristics of paraspermatogonia, allow for the recognition of the apyrene line from the euspermatogonia. Later-occurring features, including the peripheral condensation of nuclear chromatin followed by nuclear invagination, the posterior breakdown into nuclear vesicles (?caryomerites?), centriole multiplication, and the synthesis of secretory products, are the most conspicuous changes in the paraspermatogenesis process. © 2014 by Nova Science Publishers, Inc. All rights reserved.
author Giménez, Juliana
spellingShingle Giménez, Juliana
Spermatogenesis and sperm morphology
author_facet Giménez, Juliana
author_sort Giménez, Juliana
title Spermatogenesis and sperm morphology
title_short Spermatogenesis and sperm morphology
title_full Spermatogenesis and sperm morphology
title_fullStr Spermatogenesis and sperm morphology
title_full_unstemmed Spermatogenesis and sperm morphology
title_sort spermatogenesis and sperm morphology
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816311_v_n_p49_Gimenez
http://hdl.handle.net/20.500.12110/paper_97816311_v_n_p49_Gimenez
work_keys_str_mv AT gimenezjuliana spermatogenesisandspermmorphology
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