Histology of the reproductive organs of nutria, myocastor coypus (molina)

Stanley, Hugh P.; Hillemann, Howard H.

doi:10.1002/jmor.1051060304

Cited by 5 publications

(1 citation statement)

References 3 publications

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“…(2) Smooth muscle elements are not well developed in the lesser anteater. At a large number of species, the septum that circumscribes the areolas of the corpus cavernosum contains smooth muscle elements (Stanley and Hillemann, ; Cook, ; Nickel et al., ; Banks, ; Wrobel and Bergmann, ). The penile erectile tissue, specifically the cavernous smooth muscle cells, plays a key role in the erectile process (Dean and Lue, ).…”

Section: Discussionmentioning

confidence: 99%

Anatomy and Histology of the Male Reproductive Tract and Spermatogenesis Fine Structure in the Lesser Anteater (Tamandua tetradactyla, Myrmecophagidae, Xenarthra): Morphological Evidences of Reproductive Functions

Rossi

Luaces

Marcos

et al. 2012

Anat. Histol. Embryol.

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The anatomy and histology of the male genital tract of the lesser anteater were studied. Fine details of spermatozoa regarding their genesis and morphology were also studied in six adult specimens. The testes lie in the pelvic cavity. The deferent duct emerges from the epididymis and opens into the ejaculatory duct, which drains into the membranous urethra. Accessory glands (prostate, seminal vesicle and bulbourethral gland) are histologically similar to those described in other mammals. The short penis presents an urethral orifice, while the corpus spongiosum becomes thinner at the end indicating the absence of a histologically defined glans. The seminiferous epithelium shows: (1) Sertoli cells with deep nuclear indentations, (2) spermatogonia with crusty-like chromatin, (3) spermatocytes at different stages of maturation and (4) three morphologically distinct stages of spermatid differentiation according to nuclear shape, acrosome development and chromatin condensation. Sperm heads appear oval. The length of the spermatozoa averages 67.33 ± 1.60 μm. Two specimens with inactive spermatogenesis were azoospermic. Their testes and epididymis presented sizes smaller than those with active spermatogenesis. These studies together with others in anteaters may contribute to successful breeding in conservation programmes.

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Section: Discussionmentioning

confidence: 99%

Anatomy and Histology of the Male Reproductive Tract and Spermatogenesis Fine Structure in the Lesser Anteater (Tamandua tetradactyla, Myrmecophagidae, Xenarthra): Morphological Evidences of Reproductive Functions

Rossi

Luaces

Marcos

et al. 2012

Anat. Histol. Embryol.

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The definitive architecture of the placentae of nutria, Myocastor coypus (Molina)

Hillemann

Gaynor

1961

Am. J. Anat.

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Gross and microscopic anatomy of the digestive system of the nutria, Myocastor coypu bonariensis (Geoffroy)

Wagner

1963

Journal of Morphology

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Although the nutria has been an object of considerable interest and discussion during the past few years in the United States, only two previous studies on anatomy and histology have been published. Hillemann, Gaynor and Stanley ('58), and Stanley and Hillemann ('60) presented the anatomy of the genital system and histology of the reproductive organs. Since the anatomical papers mentioned above covered an up-to-date review of the literature on nutria anatomy, it is not necessary to repeat references given there. MATERIALS AND METHODSEight adult male and female nutrias were live-trapped in the marshes of Louisiana. The animals were embalmed by Dr. Horace Whitten of Waubun Laboratories, Schriever, Louisiana.A dissection microscope was employed as a means of checking dissected structures, especially of the various ducts of glands. A graphic view camera was used for photography of gross specimens. The figures are copies of india ink tracings of original drawings made at the time of dissection.Routine histological procedures including the use of Haematoxylin (Ehrlich) eosin, Van Gieson's picric-acid fuchsin, Masson's (Gomori's modification), periodicacid Schiff reaction, MacManus ('48), Biebrich Scarlet with picro anilin blue, and Wilder's reticulum stains were followed to study the microscopic anatomy. The tissues were sectioned at three microns. OBSERVATIONS AN13 DISCUSSION Gross anatomyThe general relations and arrangement of the digestive organs intact are shown in figure 1. 1.Lips. The lips (labia oris) of the nutria consist of two musculo-membranous folds ( fig. 2) capable of completely covering the incisors and the cephalic end of the oral cavity. The angles of the lips when retracted extend caudally to the posterior margin of the upper and lower incisors; i.e., under these conditions, the angles of the lips are located in the region of a broad diastema between the incisors and molars.The lateral surfaces of the lower lip encircle the incisors and meet posteriorly in a distinct narrow groove, which partially separates the ventral aspect of the tongue. On the buccal surface of the lower lip and on both sides of the lower incisor teeth are two raised folds or swellings, which measure approximately 10 X 30 millimeters. Figulla (cited by Koch, '53) referred to these structures as "lip plates" o# "lip swellings." When the mouth is closed, the lip plates are adjacent to each other; and as a consequence, the vestibule is almost completely separated from the oral cavity. The fraenula labii inferioris is thin, triangular in shape, and the distance from its point of attachment (apex) between lower incisors to the lips is approximately ten millimeters. The borders of the upper lip are adjacent to and cover the gingivae and incisors. The edges of the lips which remain free (inflexum pellitum, Weber, '27) have a tendency to meet behind the incisors to form a median raphe. The width of the upper lip is greater than the lower, and the cheek pouches of the former are

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Histology of the reproductive organs of nutria, myocastor coypus (molina)

Cited by 5 publications

References 3 publications

Anatomy and Histology of the Male Reproductive Tract and Spermatogenesis Fine Structure in the Lesser Anteater (Tamandua tetradactyla, Myrmecophagidae, Xenarthra): Morphological Evidences of Reproductive Functions

Anatomy and Histology of the Male Reproductive Tract and Spermatogenesis Fine Structure in the Lesser Anteater (Tamandua tetradactyla, Myrmecophagidae, Xenarthra): Morphological Evidences of Reproductive Functions

The definitive architecture of the placentae of nutria, Myocastor coypus (Molina)

Gross and microscopic anatomy of the digestive system of the nutria, Myocastor coypu bonariensis (Geoffroy)

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