Cyclic histological changes of the oviductal-cloacal junction in the viviparous snakeToluca lineata

Uribe, Mari Carmen; González-Porter, Gracia P.; Palmer, Brent D.; Guillette, Louis J.

doi:10.1002/(sici)1097-4687(199808)237:2<91::aid-jmor1>3.0.co;2-r

Cited by 27 publications

(31 citation statements)

References 23 publications

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“…These structures are referred to as vaginal pouches (Ludwing and Rahn 1943) and are a major characteristic of the female urodeum in Vipera ammodytes. In some non-viperid snakes the presence of a muscular sphincter has been described between the vaginal pouches and the oviduct by Uribe et al (1998). The existence of a similar sphincter has been suggested in Vipera berus (Nilson and Andrén 1982).…”

Section: Discussionmentioning

confidence: 98%

Cloacoscopy in the Horned Viper (Vipera ammodytes)

et al. 2016

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This study illustrates the main morphological structures of the cloaca of six adult horned vipers Vipera ammodytes (3.3). The coprodeum is characterized by smooth and thin mucosa, with moderate vasculature. In the centre of the coprodeum the anal sphincter is located, which separates the coprodeum from the colon. Structures of the urodeum are divided by two highly developed septa in female vipers. The urodeum in female vipers is characterized by distinct chambers, which become visible immediately behind the exit of the sphincter of the coprodeum. Vaginal pouches leading to the entrance of the oviduct are visible. The male urodeum is characterized by two distinct structures. In the upper part of the urodeum, the coprodeum sphincter surrounded by a gently folded mucosa, and the urethral papillae surface on a large mucosal protrusion emerging from the dorsal urodeum are visible in male horned vipers. The mucosal protrusion that hosts the urethral papillae can be found in two different appearances, closed or open. The proctodeum is a tubular and muscular structure that leads to the vent. Cloacoscopy is as a safe and effective method for cloaca exploration in both sexes of the horned viper. This technique may be used to assist artificial insemination in the horned viper in the future.

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Section: Discussionmentioning

confidence: 98%

Cloacoscopy in the Horned Viper (Vipera ammodytes)

et al. 2016

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“…The different oviductal regions described herein are also similar to other snakes regarding structure and function (Saint-Girons 1957;Bauman and Metter 1977;Mead et al 1981;Sever et al 2000;Siegel and Sever 2008a; . The epithelial cells secrete neutral carbohydrates and carboxylated glycosaminoglycans throughout the reproductive cycle (Gabe and Saint-Girons 1965;Uribe et al 1998;Sanchez-Martinez et al 2007;De Resende and Nascimento 2015). This constant secretory activity indicates that they act in the protection against invasive microorganisms, lubrification, and humidity maintenance avoiding the loss of water (Junqueira and Carneiro 2008).…”

Section: Morphology and Oviductal Activitymentioning

confidence: 99%

Sperm storage and morphofunctional bases of the female reproductive tract of the snake Philodryas patagoniensis from southeastern Brazil

2015

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Macroscopic and microscopic examination of the female reproductive tract of Philodryas patagoniensis was conducted in order to observe sperm storage structures and determine morphological changes throughout the reproductive cycle. The oviduct of P. patagoniensis is composed of the infundibulum (anterior and posterior), uterus, utero-vaginal junction, and vagina. The uterine epithelium showed constant secretory activity throughout the reproductive cycle, although increased production of secretory granules was observed in secondary vitellogenic females. Sperm storage occurs in the posterior infundibulum and utero-vaginal junction in pregnant, primary (postpartum), and secondary vitellogenic females. These data suggest that P. patagoniensis may be able to produce several clutches from a single mating. Sperm storage in the posterior infundibulum occurs in sperm receptacles, while in the utero-vaginal junction sperm is stored in crypts. Histochemical tests by periodic acid-Schiff revealed that both sperm storage sites increase the production of neutral carbohydrate-rich granules in the presence of sperm, similar to snakes from temperate regions. This is the first report of sperm storage in the posterior infundibulum of a neotropical snake.

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“…El conocimiento de la morfología y fisiología ovárica es importante porque permite interpretar, no solo los mecanismos que regulan la actividad reproductiva de las hembras, sino también aspectos relacionados con el desarrollo embrionario. En cuanto a la morfología ovárica y folicular, L. azarai no mostró diferencias con lo descripto para otras especies del género, con las que difiere en su modo reproductivo (Ramírez Pinilla 1991, ni para otros lagartos (Uribe et al 1996, 1998, Manes et al 2007, Uribe et al 2010.…”

Section: Discussionunclassified

Estructura ovárica y dinámica folicular de Liolaemus azarai (Squamata: Liolaemidae)

2017

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RESUMENEl estudio de la estructura ovárica y sus variaciones estacionales resulta fundamental para interpretar las estrategias reproductivas de los reptiles. Se analizó la morfología e histología del ovario de Liolaemus azarai a fin de caracterizar sus cambios y ofrecer información para determinar su ciclo reproductivo. Se registró, un nido germinal por ovario, con ovogonias y ovocitos primarios lo que evidencia que la capacidad proliferativa de la línea germinal se mantiene en el estado adulto. Durante la previtelogénesis, en todas las hembras capturadas, se verificó un incremento de hasta 30 veces el tamaño del ovocito debido al aumento del contenido citoplasmático, distinguiéndose una capa folicular con tres tipos celulares. La vitelogénesis se caracterizó por la incorporación del vitelo al ovocito y por las modificaciones que sufrió el epitelio folicular, el cual quedó formado por células planas, esta etapa se observó en septiembre, octubre, noviembre y diciembre. Se observaron cuerpos lúteos en estado avanzado del desarrollo, en octubre y en diciembre, coincidiendo con el grado de desarrollo embrionario intrauterino. Folículos atresicos se observaron en octubre y diciembre. La atresia temprana se evidenció fagocitosis del ovocito, abundantes células foliculares e invasión de células sanguíneas, mientras que en estados de atresia avanzada se observó la presencia de células autofágicas. Los resultados constituyen el primer aporte al conocimiento de la dinámica folicular de L. azarai y servirán como base para interpretar el ciclo reproductivo y desarrollo embrionario aún desconocidos para la especie.Palabras clave. Atresia, cuerpos lúteos, folículos, lagartija, ovario. ABSTRACTThe knowledge of ovarian morphology and its seasonal variations is essential to interpret the reproductive strategies of reptiles. The ovarian morphology and histology of Liolaemus azarai, was analyzed in order to characterize its changes and to provide information to determine their reproductive cycle. One germinal bed per ovary with oogonia and primary oocytes, it demonstrates that the proliferative activity of the germ line is maintained in adult. During previtellogenic stages, all of the females captured, the oocyte grows near 30 times due to increase of cytoplasmic contents, and follicular layer with three types of cells develops. The vitellogenic stages are characterized by the incorporation of the yolk platelets and important modifications in the follicular epithelium, is organized in a layer of flats cells, this time were observed in September, October, November and December. The corpora lutea was observed in an advanced stage of development, in October and December, according to the degree of intrauterine embryonic development. The atretic follicles were observed in October and December. The early atretic showed oocyte phagocytosis, abundant follicular cells and invation of blood cells;

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Cyclic histological changes of the oviductal-cloacal junction in the viviparous snakeToluca lineata

Cited by 27 publications

References 23 publications

Cloacoscopy in the Horned Viper (Vipera ammodytes)

Cloacoscopy in the Horned Viper (Vipera ammodytes)

Sperm storage and morphofunctional bases of the female reproductive tract of the snake Philodryas patagoniensis from southeastern Brazil

Estructura ovárica y dinámica folicular de Liolaemus azarai (Squamata: Liolaemidae)

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