Morfologia do sistema reprodutor masculino da Preguiça-de-Coleira (Bradypus torquatus, Illiger, 1811)

Martins, Daniele dos Santos

doi:10.1590/s1676-06032005000100035

Cited by 6 publications

(11 citation statements)

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“…In females, the body of clitoris is homologue of the male corpora cavernosa penis and the glans clitoridis is homologous with the glans penis, although it is not bipartite in structure (Evans and de Lahunta, ). In female brown‐throated sloth, the clitoris remains a bipartite structure, which could explain the similarities described in the macroscopic anatomy of the clitoris and penis in the species (Martins, ). The bodies and glandes of the clitoris were separated by a complete septum, different from humans that posses an incomplete septum (O′connell et al., ).…”

Section: Discussionmentioning

confidence: 90%

Reproductive System of Brown-throated Sloth (Bradypus variegatus, Schinz 1825, Pilosa, Xenarthra): Anatomy and Histology

Favoretto

daSilva

Menezes

et al. 2015

Anat. Histol. Embryol.

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In recent years, habitat degradation led to the decline of some populations of brown-throated sloth. The aim of this study was to describe morphological features of the female reproductive system of the species. The oval ovaries were partially surrounded by ovarian bursa. An external cortex and an inner medulla were present. Corpora lutea and corpora albicans together with follicles at various stages of development each with a single oocyte were found in the cortex. Uterine tubes were tortuous, tubular, travelled around the perimeter of the ovary and possessed a folded mucosa with ciliated pseudostratified epithelium. Uterus was simplex, with no horns and divided into three parts: a pear-shaped cranial segment and a long caudal uterine segment (both forming the body of the uterus) and two cervices. Uterus presented three layers: mucosa, lined by pseudostratified epithelium, muscular and serosa. The cervices connected the uterus to the urogenital sinus, a distensible cavity with longitudinal mucosal folds lined by transitional epithelium that extended from the external urethral orifice and the external uterine ostia to the vulva, which was lined by a keratinized stratified squamous epithelium. Brown-throated sloth presented a bipartite clitoris with paired crura, bodies and glandes. The presence of a double cervix and a bipartite clitoris was unique features of the species.

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Section: Discussionmentioning

confidence: 90%

Reproductive System of Brown-throated Sloth (Bradypus variegatus, Schinz 1825, Pilosa, Xenarthra): Anatomy and Histology

Favoretto

daSilva

Menezes

et al. 2015

Anat. Histol. Embryol.

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“…O M. retrator do pênis se origina nas laterais do reto e segue ventral ao pênis desde a rafe mediana do períneo até inserir-se na flexura sigmoide (Fig.3C), resultado semelhante ao de Pieri et al (2012) no estudo da viscacha e diferente do que descreve Martins (2003) na preguiça-de--coleira, cujo músculo retrator do pênis se origina no ramo ventral do osso púbico. Menezes et al (2003), estudando a cutia, diz que este músculo é responsável pela ereção peniana, auxiliando na cópula, sendo assim denomina este músculo como subisquiocavernoso.…”

Section: Resultsunclassified

Dimorfismo sexual e estrutura perineal em Coendou prehensilis (Ouriço-cacheiro)

Cury

Ambrósio²

2016

Pesq. Vet. Bras.

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RESUMO.-Coendou prehensilis é um mamífero da ordem Rodentia, que é composta por cinco subordens: Sciuromorfos, a qual pertencem os esquilos; Castorimorfos, onde encontramos os castores; Myomorfos, a qual encontramos os ratos; Anomaluromorfos, Lebre-saltadora, e os Histricomorfos, onde observamos a capivara. Coendou prehensilis is a mammal that belongs to the Rodentia order, which consists of five suborders: Sciuromorfos, to which the squirrels belongs; Castorimorfos where we have the beavers; Myomorfos, which include the mice; Anomaluromorfos, Hare jumper, and Hystricomorfos, where we have the capybara. We used the porcupine clerk in the research (Coendou prehensilis), one male and one female, both adults. These animals were transferred to the Laboratory of Anatomy, Department of Veterinary Medicine, Faculty of Animal Science and Food Engineering, University of São Paulo (FZEA/USP), originating from roadaccidents in Pirassununga, SP (Registration n. 43274-1 SISBIO). The animals were fixed with 10% formaldehyde and dissected in the perineum region. The results showed that the only feature which allows us to differentiate males from females is the space between anus and the genitals of the animals; the male has a larger space than the female. The perineum is an extra cavity region with lozenge definition, and this definition is formed by interpubic bones, the pubic and processes of the pubic and ischium. The male Coendou prehensilis perineum consists of five major muscles, three arranged on the urogenital diaphragm surface (ischiocavernosus muscles, M. bulbocavernosus and Mm. bulboesponjosos) and two in the pelvic diaphragm (M. levator ani and M. penis retractor). The female's perineum is composed by ischiocavernosus, bulbospongiosus, levator ani and external anal sphincter muscles. We conclude that both sexes have the ischiocavernosus muscles, Mm. bulboesponjosos, M. levator ani and external anal sphincter, and it is very important to study the perineal region of the animals, because understanding the function and location of each muscle we can contribute to future research on reproduction and animal behavior during copulation, helping to a better knowledge about reproductive potential of Erethizontidae rodents, and to contribute in the applied biotechnology development of reproduction, what can be helpful even in captivity reproduction of these animals besides the ones in free environment.

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“…Na Viscacha, M. ischiocavernosus origina-se na borda caudal da tuberosidade isquiática e da parte adjacente do ligamento sacrotuberal e está inserido sobre a "cruz" peniana, assim como no rato-topeira (Seney et al 2009) e no coelho (Zempoalteca 2008). Este músculo em humanos tem como função ϐixar os ramos do pênis à pelve e auxiliar na ejaculação ao comprimir as veias dorsais do pênis, enquanto que em fêmeas de ratos ou camundongos (Hayes 1965, Cihϐik et al 1980, McKenna & Nadelhaft 1986, Jordan 1997, Poortmans & Wyndaele 1998, Tullber 1899, está ausente ou vestigial, porém está presente em ambos os sexos de rato-topeira africanos M. retractor penis na viscacha é longo e liso, origina-se em ambos os lados do reto (Fig.2C), extende-se crânio-ventralmente ao longo da rafe mediana do períneo e se insere sobre a túnica albugínea na curva distal da ϐlexura sigmóide (Fig.2C), como descreve Guisse (1994) em baleias; e diferentemente do relatado por Martins (2003) para preguiça--de-coleira, a qual destaca que o músculo retrator do pênis como bilateral com origem no ramo ventral do osso púbico. Entretanto na cutia, segundo Menezes et al (2003), este músculo é denominado de subisquiocavernoso, pois me- diante sua contração, promove uma ereção do pênis para a introdução na fêmea no momento da cópula.…”

Section: Resultado E Discussãounclassified

Forma e função dos músculos perineais da viscacha (Lagostomus maximus)

et al. 2012

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Pesq. Vet. Bras. 32(2):183-187, fevereiro 2012 183 RESUMO.-Entre as espécies de roedores já estudadas podemos destacar a grande variação na morfologia do aparelho reprodutor masculino. Assim, considerando a importância ecológica dos roedores, e a grande representatividade numérica quanto geográϐica destes animais, bem como a escassez que aborda a anatomia reprodutiva, desenvolvemos este trabalho com um roedor histricomorfo da América do Sul, a viscacha. Este animal apresenta algumas característi-cas reprodutivas bem peculiares, desta forma descreveremos a anatomia macroscópica da musculatura perineal, e o papel dos músculos no comportamento copulatório desForma e função dos músculos perineais da viscacha (Lagostomus maximus) 1 Naira C.G. Among the rodent species studied we can highlight the wide variation in the morphology of the male reproductive system. Thus, considering the ecological importance of rodents, and the large number and geographical representation of this animal, as well as shortages regarding the reproductive anatomy, we developed this study with viscacha, a South American histricomorph rodent. As this species has some very peculiar reproductive features, we described the gross anatomy of the perineal muscles and the role of copulatory behavior. The perineal region of viscacha is composed of ϐive muscles, three of which are arranged in the superϐicial genitourinary diaphragm, as Musculus ischiocavernosus, M. bulbocavernosus and M. bulbospongiosus, and the muscles that lie at the pelvic diaphragm, M. levator ani and M. retractor penis. Therefore, we emphasize that the study of the pelvic ϐloor in wild animals is of great value, then contribute to a better understanding of the mechanisms related to erection and ejaculation or collaborate with studies on the reproduction of animals.

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Morfologia do sistema reprodutor masculino da Preguiça-de-Coleira (Bradypus torquatus, Illiger, 1811)

Cited by 6 publications

References 0 publications

Reproductive System of Brown-throated Sloth (Bradypus variegatus, Schinz 1825, Pilosa, Xenarthra): Anatomy and Histology

Reproductive System of Brown-throated Sloth (Bradypus variegatus, Schinz 1825, Pilosa, Xenarthra): Anatomy and Histology

Dimorfismo sexual e estrutura perineal em Coendou prehensilis (Ouriço-cacheiro)

Forma e função dos músculos perineais da viscacha (Lagostomus maximus)

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