Anatomical studies of the male genital organs of the European beaver

Górecki, Andrzej; Szafranek, Lidia

doi:10.4098/at.arch.81-27

Cited by 7 publications

(3 citation statements)

References 5 publications

(4 reference statements)

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“…; Alcalá & Conaway, 1968 ) and beavers (Castor spp. ; Conaway, 1958 ; Doboszynska & Zurowski, 1981 ) are mentioned in literature. Similarly, in the present study, the Müllerian duct remnants were observed in all male giant anteaters and constituted the normal morphological condition in this species.…”

Section: Discussionmentioning

confidence: 99%

Morphology of the genital organs of male and female giant anteaters (Myrmecophaga tridactyla)

Fromme

Yogui

Alves

et al. 2021

PeerJ

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Background The giant anteater belongs to the supraorder Xenarthra which occupies a systematically isolated position among placental mammals. The species is categorized as Vulnerable by the International Union for Conservation of Nature, and understanding its reproductive characteristics is critical for future conservation efforts. Methods Gross and microscopic anatomy of the genital organs of 23 male and 21 female adult and young roadkill giant anteaters in Brazil were studied. Results Male giant anteaters presented a short conical penis, intraabdominal testes, and prostate, vesicular and bulbourethral glands. A tubular remnant of the partially fused Müllerian ducts extended from the seminal colliculus through the prostate gland, continued cranially in the genital fold, bifurcated, and attached with one elongation each to the left and right epididymal corpus. The structure presented a total length of up to 10 cm and contained a yellowish liquid in its lumen. Histologically, the caudal section of this structure resembled the female vagina, the middle portion corresponded to the uterus, and the extensions showed characteristics of uterine tubes. In adult female giant anteaters, ovoid ovaries with occasional seminiferous cord-like structures were observed. The animals possessed a simple uterus, which was directly continuous with the vaginal canal. The caudal portion of the vagina had two lumina, separated by a longitudinal septum and opening into two apertures into the vaginal vestibule, cranial to the urethral opening. In the urethral and the lateral vestibular wall, glandular structures with characteristics of male prostate and bulbourethral glands, respectively, were found. The vestibule opened through a vertical vulvar cleft to the exterior. A pair of well-differentiated Wolffian ducts with a central lumen originated ventrally at the vaginal opening into the vestibule and passed in a cranial direction through the ventral vaginal and uterine wall. Each duct extended highly coiled along the ipsilateral uterine tube until the lateral pole of the ovaries where it merged with the rete ovarii. Discussion The reproductive morphology of giant anteaters reveals characteristics shared with other Xenarthrans: intraabdominal testes, a simple uterus, and a double caudal vagina. The persistence of well-differentiated genital ducts of the opposite sex in both males and females, however, singles them out among other species. These structures are the results of an aberration during fetal sexual differentiation and possess secretory functions. The possibility of a pathological degeneration of these organs should be considered in reproductive medicine of the species. Conclusion Knowledge of the unique reproductive characteristics of the giant anteater is essential for future reproductive management of the species. Additionally, further research on the peculiarities of the persisting genital duct structures might help to understand sexual differentiation in placental mammals in general.

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Section: Discussionmentioning

confidence: 99%

Morphology of the genital organs of male and female giant anteaters (Myrmecophaga tridactyla)

Fromme

Yogui

Alves

et al. 2021

PeerJ

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“…Prairie dogs have perianal sacs similar to canids and felids, which are important for sexual communication. Male beavers have persistent paramesonephric ducts that resemble a uterus and are referred to as masculine uterus (Doboszynska and Zurowski, 1981;Meier et al, 1998).…”

Section: Unique Featuresmentioning

confidence: 99%

Rodentia

Delaney

Treuting

Rothenburger

2018

Pathology of Wildlife and Zoo Animals

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“…However, they have a vital important role in terms of reproduction of species (Massanyi et al, 2003). In most male mammals, reproductive system is studied as histological or reproductive macroanatomy; such as; testis, epididymis, ductus deferens, funiculus spermaticus, accessory glands, penis and preputium: European beaver ( Doboszynska and Zurowski, 1981), Anatolian souslik (Spermophilus xanthoprymnus) (Cakır and Karatas, 2004), dog and cat (Mantis, 2008), Viscacha (Lagostomus maximus maximus) (Chaves et al, 2011), Arabian oryx (Eljarah et al, 2012); pampas deer (Ozotoceros bezoarticus) (Perez et al, 2013), dog (Souza et al, 2014). In addition, 3D reconstruction of penis and clitoris on the mice is studied (Weiss et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Male Genital Organs in the Red Fox (Vulpes vulpes); Macroanatomic and Three-dimentional Reconstruction Aspect

Haligür

Özkadif

2019

Mehmet Akif Ersoy Üniversitesi Sağlık Bilimleri Enstitüsü Dergisi

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In this study, it was aimed to describe to the genital organs, the macroanatomical aspect and threedimentional (3D) reconstruction of penis and os penis using multidetector computed tomography (MDCT) images in the male red fox (Vulpes vulpes). Six dead male red foxes were used as material. After MDCT images of the penis were obtained, they were reconstructed using a 3D modeling program (Mimics) by overlapping the images. Morphometric measurements were taken from reconstructed model of the penis and os penis. Dissections of foxes were carefully carried out under the loupes. Testis, epididymis and penis were measured from different places. In terms of anatomical aspect, in the red foxes were determined to ovoid testis and extend horizontally into the scrotum. The accessory genital glands were only prostate. The prostate was located to surround the urethra. The spongios body of penis had os penis which the urethra was pass through. The length of the penis obtained by mimics program and digital calliper were not difference. These results may contribute to the lack of the literature about male genital anatomy of the fed fox. It is thought that this study, using 3D reconsruction techniques could make anatomical studies easier to do without harming on wild animals. Öz: Bu çalışmada, erkek kızıl tilkide (Vulpes vulpes) genital organların, makroanatomik görünüşü ve multidedektör bilgisayarlı tomografi (MDBT) görüntülerini kullanarak penis ve os penisin üç boyutlu (3B) rekonstrüksiyonunu ortaya koymak amaçlanmıştır. Materyal olarak altı adet ölü erkek kızıl tilki kullanıldı. Penisin MDBT görüntüleri elde edildikten sonra, görüntüler üst üste bindirilerek bir 3B modelleme programı (Mimics) kullanılarak rekonstrüksiyonu yapıldı. Penis ve os penisin yeniden yapılandırılmış modelinden morfometrik ölçümler alındı. Tilkilerin diseksiyonu, lupların altında dikkatlice yapıldı. Testis, epididimis ve penis farklı yerlerden ölçüldü. Anatomik açıdan, kızıl tilkilerde testis ovalliği ve skrotuma yatay olarak uzandığı tespit edildi. Genital aksesuar bez olarak sadece prostat tespit edildi. Prostat uretrayı çevreleyecek şekilde yerleştiği görüldü. Pars spongiosa penisde, uretranın içinden geçtiği os penisine sahipti. Mimiks programı ve dijital kumpas ile elde edilen penisin uzunluğu farklılık göstermedi Bu sonuçlar, literatürde tilki erkek genital anatomisi hakkındaki eksikliğin giderilmesine katkıda bulunabilir. Bu çalışmada, 3B rekonstrüksiyon teknikleri kullanarak vahşi hayvanlara zarar vermeden anatomik çalışmaları yapmayı kolaylaştıracağı düşünülmektedir.

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Anatomical studies of the male genital organs of the European beaver

Cited by 7 publications

References 5 publications

Morphology of the genital organs of male and female giant anteaters (Myrmecophaga tridactyla)

Morphology of the genital organs of male and female giant anteaters (Myrmecophaga tridactyla)

Rodentia

Male Genital Organs in the Red Fox (Vulpes vulpes); Macroanatomic and Three-dimentional Reconstruction Aspect

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