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      Aspectos morfológicos, morfométricos e histoquímicos dos túbulos armazenadores de espermatozoides da fêmea do peru Meleagris gallopavo Translated title: Histology, histochemistry, and morphometry of the tubuli spermatici of femeale turkeys, Meleagris gallopavo

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          Abstract

          Fragmentos da junção uterovaginal de 16 exemplares de fêmeas adultas de peru foram examinados, com o objetivo de determinar as modificações morfométricas e histológicas dos túbulos armazenadores de espermatozoides (SST), durante os períodos de atividade e repouso reprodutivo. Os estudos foram realizados a partir de dissecações do oviduto esquerdo, utilizando-se técnicas histológicas, histoquímica e histométricas de rotina. Essas estruturas originam-se de invaginações do epitélio das pregas da região uterovaginal e apresentam-se tubulosas, simples e não ramificadas, com epitélio formado por células prismáticas estreitas, claras e escuras, com núcleo vesiculoso basal e microvilos apicais. As secreções dessas células apresentaram reações negativas para PAS e Alcian Blue, indicando ausência de mucossubstâncias. Os parâmetros morfométricos utilizados mostraram que há diferenças significativas entre os períodos de atividade reprodutiva e de repouso. Na fase de atividade reprodutiva, o comprimento tubular, o volume tubular, o volume do lume, o número de SST na junção uterovaginal, o diâmetro externo e interno, a altura celular e o número de células por túbulos estão aumentados, e observam-se espermatozoides agrupados na luz do lume e células claras e escuras nos túbulos com vesículas supranucleares no citoplasma das células tubulares. Na fase de repouso, os parâmetros morfológicos estão reduzidos e não são encontrados espermatozoides na luz do lume. Nesta fase, não são evidenciadas as células escuras nem as vesículas supranucleares no citoplasma celular.

          Translated abstract

          Fragments of the uterus-vaginal junction of 16 adult female turkeys were investigated aiming to determine the morphometrical and histological modifications in the tubuli spermatici (tubular sperm glands) during the breeding (August to March) and non-breeding (April to July) seasons. The studies were performed in dissected oviducts processed for histology, histochemistry, and morphometry of the tubuli spermatici (TS), structures which are originated from invaginations of the uterus-vaginal epithelium. TS are simple tubular glands, lined by a columnar epithelium formed by light and dark narrow cells, which presented euchromatic nucleus and apical microvillus. The TS epithelium secretion was negative for PAS and Alcian Blue stains, indicating the absence of mucosubstances. The tubular length, tubular volume, luminal volume, number of TS, as well as external and internal diameter, cellular height, and number of cells per tubule showed significant differences between the reproductive phases (breeding and non-breeding). In the breeding season, all these morphometrical parameters were increased when compared with the ones from the non-breeding season. Clusters of sperm in the lumen of the glands, as well vesicles in the cytoplasm of both light and dark epithelial cells, were observed in the breeding season. In the non-breeding season, luminal sperm, vesicles, and dark cells were not observed in the TS glands.

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          Most cited references34

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          Técnica histológica em anatomia patológica: com instrução para o cirurgião, enfermeiro e citotécnico

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            Fate of fluorescent stained sperm following insemination: new light on oviducal sperm transport and storage in the turkey.

            M Bakst (1994)
            A novel approach was used to evaluate the distribution of sperm in the oviduct of turkey hens inseminated before or after the onset of egg production. Prior to insemination, sperm were stained with the nuclear fluorescent stain bisbenzimide. Sperm distribution in the sperm storage tubules (SST) of the uterovaginal junction and the infundibular tubular glands was determined by use of simultaneous differential interference contrast and fluorescence microscopy. In hens inseminated and examined prior to the onset of egg production, 94% of the SST contained sperm (21% were filled). In contrast, in hens inseminated initially before the onset of egg production and examined after the onset of lay, only 73% of the SST contained sperm (5% were filled); and in hens inseminated initially after the onset of lay and then examined, 78% of the SST contained sperm (4% were filled). Sperm were sparsely distributed in the infundibular tubular glands. Therefore, lower percentages of filled SST were associated with the onset of egg production, an indication that the sperm storage capacity of the SST is diminished with the onset and continuation of egg production. Physical events associated with the daily ovulatory cycle, such as rotation of the egg mass during shell formation, may both displace sperm residing in the SST and diminish the efficacy of sperm entry into the SST.
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              Histopathologic tecnic and pratical histochemistry

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                abmvz
                Arquivo Brasileiro de Medicina Veterinária e Zootecnia
                Arq. Bras. Med. Vet. Zootec.
                Universidade Federal de Minas Gerais, Escola de Veterinária (Belo Horizonte )
                1678-4162
                February 2009
                : 61
                : 1
                : 72-79
                Affiliations
                [1 ] PUC
                [2 ] Universidade Federal de Minas Gerais Brazil
                Article
                S0102-09352009000100011
                10.1590/S0102-09352009000100011
                dab2e572-a997-4c9b-9475-3c8bbac2586f

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0102-0935&lng=en
                Categories
                VETERINARY SCIENCES

                General veterinary medicine
                female,turkey,tubuli spermatici,spermatozoa,morphometry,peru,fêmea,túbulos armazenadores,espermatozoide,morfometria

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