Histological description of the reproductive tract of male and female hatchlings of the Magdalena river turtle (Podocnemis lewyana).

Sánchez-Ospina, Andrés C.; Rodríguez, Berardo de J; Ceballos, Claudia P.

doi:10.15446/abc.v19n3.42334

Cited by 6 publications

(7 citation statements)

References 25 publications

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“…The testicular morphology of Indonesian box turtles with SCL sizes of 10 cm and 12.5 cm were spheroid in shape and more translucent in color. These results were in line with the results of a study on the morphological description of immature Magdalena River turtle (Podocnemis lewyana) (Sanchez-Ospina et al, 2014). However, it was different from the mature turtles that were spread on Central Sulawesi (Cuora amboinensis, Leucocephalon yuwonoi, and Indotestudo forstenii) which were ovoid in shaped and yellowish in color (Tagunu et al, 2018).…”

Section: Discussionsupporting

confidence: 81%

Determination of sexual maturity of Indonesian box turtle (Cuora amboinensis couro) based on straight carapace length

Daniel¹,

Srianto²,

Hamid

et al. 2022

Ovz

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Predicting the turtle's reproductive status and sexual maturity is necessary for ex-situ breeding and conservation program. The histology of the seminiferous tubules of the Indonesian box turtle (Cuora amboinensis couro) at various ages has not been studied much. This study aims to develop equations to predict the sexual maturity of Indonesian box turtles based on straight carapace length (SCL). Six turtles with SCL sizes 10-21 cm were sacrificed and their testes were taken for morphometric measurements and histological preparations for Hematoxylin Eosin staining. Pearson’s correlation of SCL with testicular maturity parameters was analyzed, followed by Anova Regression. The results showed that there were differences in the morphometry and topographic anatomy of the Indonesian box turtle testes between SCL below 15 cm and above 15 cm. Six turtles with SCL size of 10-21 cm were sacrificed and their testes were taken for morphometric measurements and histological preparations for Hematoxylin Eosin staining. Pearson's correlation of SCL with testicular maturity parameters was analyzed, followed by Regression Anova. The results showed that there were differences in the morphometry and topographic anatomy of the Indonesian box turtle testes between SCL below 15 cm and above 15 cm.

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Section: Discussionsupporting

confidence: 81%

Determination of sexual maturity of Indonesian box turtle (Cuora amboinensis couro) based on straight carapace length

Daniel¹,

Srianto²,

Hamid

et al. 2022

Ovz

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show abstract

“…The testicular pigmentation has been suggested to be implicated in thermoregulation by increasing the testicular temperature that may be correlated with increased male sexual activity (Guillette et al, ). This pigmentation is also detectable in the epididymal sheath, as in the turtles Chrysemys picta (Holmes & Gist, ) and Podocnemis lewyana (Sánchez‐Ospina, Rodríguez, & Ceballos, ).…”

Section: Discussionmentioning

confidence: 92%

Microanatomy of the testes and testicular ducts of the butterfly lizard, Leiolepis ocellata Peters, 1971 (Reptilia: Squamata: Agamidae) during the active reproductive period

Pewhom

Srakaew

2018

Acta Zoologica

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The microanatomy of the testes and testicular ducts (rete testis, ductuli efferentes, ductus epididymis and ductus deferens) of Leiolepis ocellata (Agamidae) was investigated using light microscopy including histochemistry. Each testis contains seminiferous tubules and interstitial tissues. The former house spermatogenic cells (spermatogonia A & B, preleptotene, primary and secondary spermatocytes, spermatids (steps 1–8) and spermatozoa) and Sertoli cells, while the latter comprise peritubular and intersitial tissues. The rete testis is an anastomosing duct, having intratesticular and extratesticular portions. The proximal region of ductuli efferentes has wider outer ductal and luminal diameters than those of the distal region. The convoluted ductus epididymis is subdivided into four regions (initial segment, caput, corpus and cauda), based on the ductal diameter, epithelium characteristics and cell components. The ductus deferens has the greatest diameter and is divided into the ductal and ampulla ductus deferens. The ductal portion is subdivided into the proximal and distal regions, based on the epithelium types and ductal diameters. The ampulla ductus deferens is a fibromuscular tube, having numerous mucosal folds projecting into the lumen. Spermiophagy is detectable in the ductus epididymis and ductus deferens. The present results contribute to improved fundamental knowledge on the microanatomy of the reptilian reproductive system.

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“…Несмотря на то, что вопросам морфофункциональной характеристики органов мужской репродуктивной системы позвоночных посвящено много фундаментальных работ: например, на материале амфибии [15,17], рептилий [19,20,21,22,29], птиц [9,10], млекопитающих [1,2,8,11,13], на сравнительном материале [2,4,9,25], многие вопросы взаимоотношений половых и соматических клеток в репродуктивной системе позвоночных продолжают оставаться малоизученными, либо дискуссионными и нуждаются в дальнейшем уточнении. Так, например, нуждаются в уточнении вопросы механизмов влияния различных негативных воздействий на организмы, приводящие к ухудшению созревания сперматозоидов в извитых семенных канальцах и в придатке семенника.…”

Section: The Relationship Of Gametes and Somatic Cells Of Male Gonads...unclassified

The Relationship of Gametes and Somatic Cells of Male Gonads of Vertebrates: Evolutionary, Age and Seasonal Aspects, Adaptive and Reactive Transformations Under the Action of Destabilizing Factors

Shevlyuk,

Blinova,

Egemberdieva

et al. 2024

Žurnal anatomii i gistopatologii

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The aim of the study is a comparative analysis of the morphofunctional interactions of germ and somatic cells in the organs of the male reproductive system of vertebrates during ontogenesis, under conditions of changes in reproductive activity and under the influence of destabilizing factors. Material and methods. Using light and electron microscopy, immunohistochemistry and morphometry, the testes of representatives of various classes of vertebrates (amphibians, reptiles, birds and mammals) were studied. The collection of material was carried out in environmentally safe ecosystems and in ecosystems with high anthropogenic load in the Orenburg region of Russia and in the Aktobe region of the Republic of Kazakhstan. Results. Based on the material of our own studies of the gonads, as well as on the basis of information from modern domestic and foreign literature, the patterns of relationships between germ cells and somatic cells of their microenvironment in the testes of vertebrates are shown. The features of the structural organization of the germinal and endocrine components of the male gonads are considered. The features of the structural organization of intertitial endocrinocytes (Leydig cells) are shown, and their high resistance to the action of various destabilizing factors compared to spermatogenic epithelium is established. Pubertal generation of endocrinocytes in vertebrate testes during reproductive age is characterized by stability in cell numbers and belongs to cell populations of a stable type. The role and significance of the structures of the blood-testis barrier are shown and the morphological equivalents of changes in the permeability of this barrier are established; it is revealed that in the studied animals, under the influence of negative anthropogenic factors, the integrity of the blood-testis barrier in the testes is violated. The action of destabilizing factors leads to a decrease in the number of developing germ cells in the lumen of the epididymal tubules (up to their complete disappearance in individual individuals), which is probably due to the deterioration of the trophic influences on them from the structures of the epididymis. Conclusion. The principle of organization of the main compartments of the testes, the convoluted seminiferous tubules and the interstitium of the organ, formed during evolution, probably turned out to be evolutionarily advantageous, since it is represented in the testes of all amniotes - reptiles, birds and mammals. In the process of evolutionary development, several types of structural organization of convoluted seminiferous tubules and interstitium were formed in the testes of vertebrates. The need to protect developing germ cells from the effects of immunocytes, which led to the formation of a blood-testis barrier in the testes.

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Histological description of the reproductive tract of male and female hatchlings of the Magdalena river turtle (Podocnemis lewyana).

Cited by 6 publications

References 25 publications

Determination of sexual maturity of Indonesian box turtle (Cuora amboinensis couro) based on straight carapace length

Determination of sexual maturity of Indonesian box turtle (Cuora amboinensis couro) based on straight carapace length

Microanatomy of the testes and testicular ducts of the butterfly lizard, Leiolepis ocellata Peters, 1971 (Reptilia: Squamata: Agamidae) during the active reproductive period

The Relationship of Gametes and Somatic Cells of Male Gonads of Vertebrates: Evolutionary, Age and Seasonal Aspects, Adaptive and Reactive Transformations Under the Action of Destabilizing Factors

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