Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment
Synbranchus marmoratus, is a protogynic diandric species in which two types of males, primary and secondary, are found. In both types, the germinal compartment in the testes is of the unrestricted lobular type, but in secondary (sex reversed females) males the lobules develop within the former ovari...
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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00408166_v35_n2_p121_LoNostro http://hdl.handle.net/20.500.12110/paper_00408166_v35_n2_p121_LoNostro |
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paper:paper_00408166_v35_n2_p121_LoNostro2023-06-08T15:04:40Z Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment Lo Nostro, Fabiana Laura Meijide, Fernando Javier Guerrero, Graciela Alicia Biflagellated sperm Germinal compartment Sex reversal Spermatogenesis Synbranchidae Synbranchus marmoratus acrosome animal cell animal tissue article basement membrane cell maturation cell type cell ultrastructure controlled study dense body germ cell kinetosome male microscopy mitochondrion nonhuman nucleolus scanning electron microscopy Sertoli cell sperm spermatid spermatocyte spermatogenesis spermatogonium spermatozoon spermatozoon tail teleost testis transmission electron microscopy Synbranchidae Synbranchus marmoratus Teleostei Synbranchus marmoratus, is a protogynic diandric species in which two types of males, primary and secondary, are found. In both types, the germinal compartment in the testes is of the unrestricted lobular type, but in secondary (sex reversed females) males the lobules develop within the former ovarian lamellae. In the present study, the germinal compartment was examined in both types of males using light microscopy as well as scanning and transmission electron microscopy. Germinal compartment is limited by a basement membrane and contains Sertoli and germ cells. During maturation, processes of Sertoli cells form the borders of spermatocysts containing isogenic germ cells. Characteristically, type A and type B spermatogonia have a single nucleolus and grouped mitochondria associated with dense bodies or nuage. Type B spermatogonia, spermatocytes and spermatids are joined by cytoplasmatic bridges and are confined within spermatocysts. Secondary spermatocytes are difficult to find, indicating that this stage is of short duration. Biflagellated spermatozoa have a rounded head, no acrosome, and possess a midpiece consisting of two basal bodies, each of which produces a flagellum with a typical 9 + 2 microtubular composition. No associations occur between sperm and Sertoli cells. There were no differences between spermatogenesis in primary and secondary males in this protogynic, diandric fish. © 2003 Elsevier Science Ltd. All rights reserved. Fil:Lo Nostro, F.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Meijide, F.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Guerrero, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00408166_v35_n2_p121_LoNostro http://hdl.handle.net/20.500.12110/paper_00408166_v35_n2_p121_LoNostro |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Biflagellated sperm Germinal compartment Sex reversal Spermatogenesis Synbranchidae Synbranchus marmoratus acrosome animal cell animal tissue article basement membrane cell maturation cell type cell ultrastructure controlled study dense body germ cell kinetosome male microscopy mitochondrion nonhuman nucleolus scanning electron microscopy Sertoli cell sperm spermatid spermatocyte spermatogenesis spermatogonium spermatozoon spermatozoon tail teleost testis transmission electron microscopy Synbranchidae Synbranchus marmoratus Teleostei |
| spellingShingle |
Biflagellated sperm Germinal compartment Sex reversal Spermatogenesis Synbranchidae Synbranchus marmoratus acrosome animal cell animal tissue article basement membrane cell maturation cell type cell ultrastructure controlled study dense body germ cell kinetosome male microscopy mitochondrion nonhuman nucleolus scanning electron microscopy Sertoli cell sperm spermatid spermatocyte spermatogenesis spermatogonium spermatozoon spermatozoon tail teleost testis transmission electron microscopy Synbranchidae Synbranchus marmoratus Teleostei Lo Nostro, Fabiana Laura Meijide, Fernando Javier Guerrero, Graciela Alicia Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment |
| topic_facet |
Biflagellated sperm Germinal compartment Sex reversal Spermatogenesis Synbranchidae Synbranchus marmoratus acrosome animal cell animal tissue article basement membrane cell maturation cell type cell ultrastructure controlled study dense body germ cell kinetosome male microscopy mitochondrion nonhuman nucleolus scanning electron microscopy Sertoli cell sperm spermatid spermatocyte spermatogenesis spermatogonium spermatozoon spermatozoon tail teleost testis transmission electron microscopy Synbranchidae Synbranchus marmoratus Teleostei |
| description |
Synbranchus marmoratus, is a protogynic diandric species in which two types of males, primary and secondary, are found. In both types, the germinal compartment in the testes is of the unrestricted lobular type, but in secondary (sex reversed females) males the lobules develop within the former ovarian lamellae. In the present study, the germinal compartment was examined in both types of males using light microscopy as well as scanning and transmission electron microscopy. Germinal compartment is limited by a basement membrane and contains Sertoli and germ cells. During maturation, processes of Sertoli cells form the borders of spermatocysts containing isogenic germ cells. Characteristically, type A and type B spermatogonia have a single nucleolus and grouped mitochondria associated with dense bodies or nuage. Type B spermatogonia, spermatocytes and spermatids are joined by cytoplasmatic bridges and are confined within spermatocysts. Secondary spermatocytes are difficult to find, indicating that this stage is of short duration. Biflagellated spermatozoa have a rounded head, no acrosome, and possess a midpiece consisting of two basal bodies, each of which produces a flagellum with a typical 9 + 2 microtubular composition. No associations occur between sperm and Sertoli cells. There were no differences between spermatogenesis in primary and secondary males in this protogynic, diandric fish. © 2003 Elsevier Science Ltd. All rights reserved. |
| author |
Lo Nostro, Fabiana Laura Meijide, Fernando Javier Guerrero, Graciela Alicia |
| author_facet |
Lo Nostro, Fabiana Laura Meijide, Fernando Javier Guerrero, Graciela Alicia |
| author_sort |
Lo Nostro, Fabiana Laura |
| title |
Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment |
| title_short |
Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment |
| title_full |
Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment |
| title_fullStr |
Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment |
| title_full_unstemmed |
Ultrastructure of the testis in Synbranchus marmoratus (Teleostei, Synbranchidae): The germinal compartment |
| title_sort |
ultrastructure of the testis in synbranchus marmoratus (teleostei, synbranchidae): the germinal compartment |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00408166_v35_n2_p121_LoNostro http://hdl.handle.net/20.500.12110/paper_00408166_v35_n2_p121_LoNostro |
| work_keys_str_mv |
AT lonostrofabianalaura ultrastructureofthetestisinsynbranchusmarmoratusteleosteisynbranchidaethegerminalcompartment AT meijidefernandojavier ultrastructureofthetestisinsynbranchusmarmoratusteleosteisynbranchidaethegerminalcompartment AT guerrerogracielaalicia ultrastructureofthetestisinsynbranchusmarmoratusteleosteisynbranchidaethegerminalcompartment |
| _version_ |
1768541837258129408 |