Estrutura e ultraestrutura do oviduto de fêmeas de Hemidactylus mabouia (Reptilia, Gekkonidae) no período vitelogênico, com ênfase na estocagem e fagocitose de espermatozóides

• Autor(a) principal: Nogueira, Katiane de Oliveira Pinto Coelho
• Data de Publicação: 2010
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/240
• topic: Espermatozóide; Estocagem; Fagocitose; Morfologia; Oviduto; Squamata; Ultraestrutura; Spermatozoa; Storage; Phagocytosis; Morphology; Oviduct; Squamata; Ultrastructure; CNPQ::CIENCIAS BIOLOGICAS::BIOLOGIA GERAL

The reproductive system of females of Hemidactylus mabouia consists of a pair of ovaries and oviducts that are histologically divided into four distinct portions denominated, infundibulum, uterine tube, uterus and vagina. The infundibulum, anterior region of the oviduct, opens into the coelomic cavity and receives the oocyte released at the time of ovulation. The uterine tube is lined by simple epithelium that invaginates to form specialized structures, the crypts of sperm storage. At the bottom of the crypts can be observed sperm arranged in bundles with their heads very close to the epithelial cells and tails oriented parallel to the light of the uterine tube. The uterus, glandular region of the oviduct, is responsible for production and deposition of the eggshell. The final region of the oviduct, the vagina, has two segments characterized as anterior and posterior. The anterior vagina is lined by a simple epithelium composed of ciliated cells and two types of non-ciliated cells characterized as secretory and phagocytic. The non-ciliated phagocytic cells are responsible for phagocytosis of large numbers of sperm found in this region. This process is probably related to the elimination of supernumerary or defective sperm. The posterior vagina, which opens into the cloaca, is the only region of the oviduct consists of stratified epithelium. The study of morphologic aspects of the female reproductive tract of H. mabouia contributes, along with works of ecological and behavioral, to expand the knowledge of the reproductive biology of this exotic species, providing tools for interspecific comparisons, and strategies for control and management.