Histologia da pele escrotal e túnica vaginal da cuíca Philander opossum (Linnaeus, 1758): Didelphidae - Marsupialia

Ribeiro, Maria das Graças; Nogueira, José Carlos

doi:10.1590/s0101-81751990000300005

Cited by 6 publications

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“…Similar findings were described in a study focused on the morphology of Didelphidae's scrotum (Nogueira, Godinho, & Cardoso, 1977;Ribeiro & Nogueira, 1990).…”

Section: Discussionsupporting

confidence: 86%

Histomorphometrical study on the skin of different regions of the Caribbean common opossum (Didelphis marsupialis Linnaeus, 1758)

Mohamed

Pérez

Veiga

2020

Anat Histol Embryol

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Common opossums (Didelphis marsupialis) are found throughout the Caribbean island of Trinidad and Tobago. The present work was conducted on the fresh normal skin of 10 common opossums and aimed to provide morphometric data and a histological description of the skin in different regions of the body. In the examined regions, the skin presented a typical thin skin morphology, with numerous folds on the surface. The dermis–epidermis junction is smooth, without the occurrence of dermal papillae. The average thickness of the opossum epidermis was 19.5 µm. The cranial region of the back showed the greatest epidermal thickness, and together with the other areas of the back presented an epidermis 2–3 times thicker compared with the other areas examined. To further confirm that the skin changes in the opossum are age‐ or diet‐related, additional studies are required.

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“…Similar findings were described in a study focused on the morphology of Didelphidae's scrotum (Nogueira, Godinho, & Cardoso, 1977;Ribeiro & Nogueira, 1990).…”

Section: Discussionsupporting

confidence: 86%

Histomorphometrical study on the skin of different regions of the Caribbean common opossum (Didelphis marsupialis Linnaeus, 1758)

Mohamed

Pérez

Veiga

2020

Anat Histol Embryol

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“…microtarsus scrotum shows the lining tunics, namely, dartos tunic which is closely related to the skin and allows the withdrawal of the scrotum; vaginal tunic at the parietal and visceral section; albuginea tunica adherent to the testicles, as described in Philander opossum NOGUEIRA, 1990b). Whereas the parietal vaginal tunic was highly pigmented with melanin as in American marsupials (FINKEL, 1945), the visceral tunic had a light hue and was similar to that in Didelphis sp.…”

Section: Discussionmentioning

confidence: 87%

Morphological study of the male genital organs of Gracilinanus microtarsus

Lima

Santos

Viana

et al. 2013

Braz. J. Vet. Res. Anim. Sci.

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Gracilinanus microtarsus is one of the smallest marsupials on earth. Since it spreads seeds, it has great ecological relevance. However, its reproduction data, especially those related to the anatomy of its reproduction apparatus, are scarce in the literature. Current analysis describes the male genital organs of six adult specimens of G. microtarsus. Macroscopic studies were undertaken on dissected organs, whereas histological studies were performed by inclusion technique in paraffin and by hematoxylin and eosin, and Masson trichrome staining. The male genital organs and accessory glands of G. microtarsus consist of two testicles within a pendular scrotum, placed cranially to the penis, featuring a histology consisting of seminiferous tubules with spermatogenic cells, spermatozoa and Sertoli cells, and a peritubular region with Leydig cells; testicles closely associated with epididymis with head, body and tail, with histological differences between the different regions; deferent ducts; funiculus spermaticus; accessory glands composed of prostate, divided into three distinct segments and bulbourethral glands; pelvic and penile urethra and penis with bifid glans. Results show that the male genital organs and accessory glands of G. Microtarsus are anatomically similar to that found in Didelphis sp. and other marsupials groups, with slight details such as the site of each organ.Keywords: Didelphimorphia. Marsupials. Reproduction. Prostatic segments. ResumoGracilinanus microtarsus é um dos menores marsupiais do mundo. Possui grande potencial dispersor de sementes e por esta razão apresenta grande importância ecológica. No entanto, dados em relação à reprodução desses animais são escassos na literatura, principalmente, aqueles relacionados à anatomia dos órgãos do aparelho reprodutor. Por essa razão, objetivamos com este estudo realizar uma descrição dos órgãos genitais masculinos em seis exemplares de G. microtarsus adultos. Para tanto, realizamos estudos macroscópicos por dissecação dos órgãos e estudos histológicos por técnica de inclusão em parafina e coloração em hematoxilina e eosina, e tricromo de Masson. Encontramos, que os órgãos genitais masculinos e glândulas acessórias em G. microtarsus são representados por dois testículos localizados dentro de um escroto pendular, posicionados cranialmente ao pênis, cuja histologia revelou túbulos seminíferos com espermatogônias, espermatozoides e células de Sertoli e região peritubular com células de Leydig; testículos em íntima associação com os epidídimos, divididos em cabeça, corpo e cauda, com diferenças histológicas entre as diferentes regiões; ductos deferentes; funículo espermático; glândulas anexas compostas pelas glândulas prostáticas divididas em três distintos segmentos e glândulas bulbouretrais; uretra pélvica e peniana e um pênis com glande bífida. Concluímos que os órgãos genitais e as glândulas acessórias masculina de G. microtarsus, anatomicamente são muito semelhantes aos dos Didelphis sp. e outros grupos de marsupiais, diferenciando-se apenas...

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“…De acordo com Barnes (1977), nos gêneros Marmosa, Caluromys e Antechinus, Nogueira et al (1977Nogueira et al ( , 2003, Nogueira (2012) em Didelphis albiventris e Martinelli (1990) em M. cinerea, a pele escrotal nesses marsupiais apresenta-se pigmentada. Entretanto, não foi observado o escurecimento da pele escrotal em P. opossum (Ribeiro & Nogueira 1991) e Chironectes minimus (Nogueira et al 2004). Com relação à presença e a distribuição de pelos no escroto, M. nudicaudatus se assemelha ao descrito por Nogueira et al (1977) em D. albiventris, Ribeiro & Nogueira (1982) em P. opossum, Martinelli (1990) (Setchell 1977, Woolley & Scarlett 1984, Cummins et al 1986.…”

Section: Discussionunclassified

Morfologia do escroto, do testículo e das vias espermáticas de Metachirus nudicaudatus (Geoffroy, 1803), Didelphidae-Marsupialia

et al. 2015

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ABSTRACT.-Costa S.F., Nogueira J.C., Soares B.A., Ambrósio N.A., Chaves A.S., Melo L. Gonads and sperm pathways of five adult male Metachirus nudicaudatus in the reproductive phase were used to describe the morphology of scrotum, testicle, and spermatic tract. M. nudicaudatus has a scrotum pre-penis which contains the testicles permanently. The scrotal skin is not pigmented and has few hairs and glands. The parietal vaginal tunic is slightly pigmented. The testicles are oval and connected to the epididymis by testicular-epididymal pedicle; they are surrounded externally by the testicular capsule and supported by a stroma of connective nature. Interstitial cells are the predominant elements in abundant intertubular tissue. The seminiferous tubules are wide, meandering and surrounded by a fibro-elastic coat, containing myoid cells. The seminiferous epithelium is composed of spermatogenic cells and Sertoli cells interspersed. The seminiferous tubules converge toward the end of the testis capitata, getting coated only support cells, featuring a transition region between the seminiferous tubules and straight tubules, occupied by a type "valve" structure that partially blocks the tubular lumen. Straight tubules together to form a single efferent ductule, which runs a small intra-testicular extent, penetrates through the tunica and the pedicle testis--epididymis. The flexuosa part of the efferent ductule forms a separate lobe in the medial part of the body of the epididymis. The epididymis is enveloped by a capsule and epididymal comprising the epididymal duct, which is quite entangled. The epididymal duct is lined by pseudostratified columnar epithelium with simple principal, basal, apical and "clear halo" cells. The main cells are prevalent and have morphological and histochemical differing characteristics along the duct, enabling to characterize nine different epididymal areas. In the lumen of the seventh area (top of tail) that starts the pairing of sperm. This phenomenon coincides well with morphological change and a larger amount of neutral muco-substances is secreted in that area. Vas deferens has three parts: fair-epididymal, abdominal and funicular part, based on histological and histochemical changes of the epithelium and surrounding components. The vas deferens has no bulb and even crosses the ureter before flowing into the urethra. The spermatic cord contains the vas deferens, testicular artery and veins, lymphatic vessels, nerves and developed cremaster muscle. Its components have structural changes in the proximal, middle and distal region, with a peculiar admirable network.

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Histologia da pele escrotal e túnica vaginal da cuíca Philander opossum (Linnaeus, 1758): Didelphidae - Marsupialia

Abstract: ABSTRACT

Cited by 6 publications

References 0 publications

Histomorphometrical study on the skin of different regions of the Caribbean common opossum (Didelphis marsupialis Linnaeus, 1758)

Histomorphometrical study on the skin of different regions of the Caribbean common opossum (Didelphis marsupialis Linnaeus, 1758)

Morphological study of the male genital organs of Gracilinanus microtarsus

Morfologia do escroto, do testículo e das vias espermáticas de Metachirus nudicaudatus (Geoffroy, 1803), Didelphidae-Marsupialia

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