Download scientific diagram | Gonad histology of ranid frogs. (A) Green frog testis with a single oocyte (arrow). Inset shows typical stage II oocyte morphology.
Bar represents 50 m. (B) Green frog with an extra-testicular oocyte lying between the testis (T) and kidney (K) (arrow). April 12, 2013 -The vasa efferentia, ducts from the testes, pass between the folds of the mesorchium and into the mesial margin of the adjacent kidney.
During the breeding season, or after slight compression of the testis of the hibernating frog, these ducts become the more apparent due to the presence in them of whitish masses of spermatozoa in suspension. November 6, 2018 -Our study applies the powerful technique of scanning electron microscopy (SEM) of vascular corrosion casts (Aharinejad & Lametschwandtner, 1992; Lametschwandtner, Lametschwandtner, & Weiger, 1990; Motta, Murakami, & Fujita, 1992; Murakami, 1971) and gives to our knowledge the first detailed analysis of the testicular microvascular anatomy in an anuran amphibian in correlation with histomorphology. In cast analyses, we use the characteristic endothelial cell nuclei imprints on cast surfaces to clearly differentiate arteries from veins (Miodonski, Hodde, & Bakker, 1976).
In SEM micrographs, arteries (in red) and veins (in blue) are coloured accordingly to facilitate recognition of vessel nature, course and patterns. Sex is determined genetically in amphibians; however, little is known about the sex chromosomes, testis-determining genes, and the genes involved in testis differentiation in this class. Certain inherent characteristics of the species of this group, ...
May 28, 2008 -Reproduction in the Mexican leaf frog, Pachymedusa dacnicolor, II. The male. Gen Comp Endocrinol 62: 23–35.
... Raucci F,Assisi L,D'Aniello S,Spinelli P,Botte V,Di Fiore MM. 2004.
Testicular endocrin activity is upregulated by D-aspartic acid in the green frog, Rana esculenta. Nikon Instruments | Nikon Global | Nikon Small World · Galleries · Frog Testis Stained Thin Section · The breeding behavior of frogs is one of their most distinctive characteristics. The annual occurrence takes place in freshwater, usually in still or slow-moving areas.
August 3, 2020 -However, there are few studies on the gametogenesis of anamniotes vertebrates, especially anurans. Therefore, the purpose of this study was to analyze the histological feature of germ cells and their arrangement in the testis of Levantine frog, Pelophylax bedriagae (Camerano, 1882). Frogs live in almost every environment on Earth and breed in a wide variety of areas.
Though the annual event usually takes place in still ... Turning the five endemic frog species that inhabit the Sierra Nevada de Santa Marta (SNMS) into objectives of great interest for the conservation of the genus (IUCN, 2021), among which are the three species under study. This investigation describes for the first time the testicular morphology in adult males of Atelopus laetissimus Ruiz-Carranza et al., 1994, Atelopus nahumae Ruiz-Carranza et al., 1994, and Atelopus carrikeri Ruthven, 1916 to know part of their reproductive cycle, providing information on the histological and structural characteristics of the spermatogenic cells.
➢ Male genital system of frog · o Testes are two small · ovoid bodies,yellowish · in colour. Each testis is · connected to upper part · of a kidney. o Each testis opens into · the kidney with the help · of numerous fine ducts · called vasa efferentia ·
