Hormones and the Sex Ducts and Sex Accessory Structures of Reptiles

Gist, Daniel H.

doi:10.1016/b978-0-12-374930-7.10005-6

Cited by 8 publications

(10 citation statements)

References 140 publications

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“…The rete tubule epithelium consists of the ciliated and non‐ciliated cells, similar to those in Hemidactylus turcicus (Rheubert et al, ). The junction between the rete testis and ductuli efferentes shows gradual epithelial transition, as opposed to other reptiles with abrupt epithelial transition from a non‐ciliated cuboidal epithelium of the rete testis to a ciliated columnar epithelium (Gist, ). The negative histochemical reactions for neutral, carboxylated acid and sulphated acid mucopolysaccharides/glycoproteins in the rete testis of L. ocellata are similar to those in Agkistrodon piscivorus (Siegel et al, ) and S. lateralis (Sever et al, ), while these substances have been shown histochemically in the rete testis of H. turcicus (Rheubert et al, ), L. pygaea (Sever, ), Hydrophis platurus (formerly Pelamis platurus ) (Sever & Freeborn, ).…”

Section: Discussionmentioning

confidence: 88%

“…Reptiles have common reproductive strategies, with attributes including production of amniotic shelled eggs, internal fertilization with the exception of some species displaying parthenogenesis and oviparous or viviparous modes of reproduction (Blackburn, ; Gist, ; Neaves, ; Stewart & Blackburn, ). The male reproductive system consists of the paired testes, testicular ducts, sexual segment of the kidney in squamate reptiles and cloaca (Gist, ; Rheubert, Sever, Geheber, & Siegel, ; Rheubert, Sever, Siegel, & Trauth, ). The testes are encapsulated by the connective tissue and divided into tubular and interstitial compartments, typical of the vertebrate testes (Gribbins & Rheubert, ; Kumar, Roy, & Rai, ; Russell, Ettlin, Hikim, & Clegg, ).…”

Section: Introductionmentioning

confidence: 99%

“…Testicular functions include spermatogenesis and steroidogenesis (Kumar et al, ; Lombardi, ). The testicular ducts comprise the rete testis, ductuli efferentes, ductus epididymis and ductus deferens (Gist, ; Rheubert et al, ). These ducts serve as a passageway for spermatozoa and augment their maturation (Rheubert et al, ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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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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“…variabilis is closely coupled to the presence of receptive females (i.e., vitellogenic females; Benabib, ), which are abundant from November to August (population located at Los Tuxtlas, 45 masl, approximately 26 km NW from the study site). In cyclical patterns of lizards, principal cells from the epididymis (i.e., epididymal epithelium) exhibit histological, cytological and physiological changes throughout the year related to testosterone levels (Gist, ). In S .…”

Section: Discussionmentioning

confidence: 99%

Spermatogenesis in Sceloporus variabilis (Squamata, Phrynosomatidae): A non‐quiescent pattern

et al. 2017

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Gaining a deeper understanding of spermatogenic cycles within squamates has aided in our knowledge of the controls of reproduction and has bettered our understanding of reproductive phenology. One of the most studied genera of squamates, Sceloporus, is widely distributed along a latitudinal and elevational gradient in temperate, tropical, low-elevation and high-elevation habitats. Due to this wide distribution and varying habitats, Sceloporus exhibit differences in their spermatogenic activity (including both cyclical and acyclical patterns) and may be one of the most useful genera for understanding the abiotic correlations with spermatogenesis. The spermatogenic activity in Sceloporus variabilis was studied histologically (in a population that inhabits a tropical region at Los Tuxtlas, Veracruz, Mexico) and found to exhibit a unique cyclical pattern with an extended period of maximum activity (from November to July) and the absence of regression and quiescence. Furthermore, these data corroborate previous works on the spermatogenic cycles of S. variabilis despite different populations utilised. These data suggest that although abiotic factors may play a role in the timing of spermatogenesis, phylogenetic signal may be equally as important. More data concerning spermatogenic cycles in phylogenetically related taxa from differing habitats will elucidate the patterns of spermatogenic diversity. K E Y W O R D Scyclical spermatogenesis, histology, lizard, reproduction, testis

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“…This controversy could be explained by the complex PR regulation in reptiles. As it has been previously reported, PR levels could be regulated by other factors besides estrogen action (Gist, 2011;Jones, 2011).…”

Section: Temperature-induced Gonadal Development and Differentiationmentioning

confidence: 60%

Disruption of the developmental programming of the gonad of the broad snouted caiman (Caiman latirostris) after in ovo exposure to atrazine

Canesini

Galoppo

Tavalieri

et al. 2023

Environ Sci Pollut Res

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Environmental exposure to agrochemicals during early stages of development can induce subtle alterations that could permanently affect normal physiology. Previously, we reported that in ovo exposure to atrazine (ATZ) disrupts testicular histoarchitecture in postnatal caimans (Caiman latirostris). To assess whether such alterations are the result of disruption of gonadal developmental programming, this study aimed to evaluate the expression of histofunctional biomarkers (VASA, ER, PR, PCNA, and aromatase) and genes involved in gonadal development and differentiation (amh, sox-9, sf-1 and cyp19-a1) in the gonads of male and female caiman embryos and to assess the effect of ATZ exposure on these biomarkers and genes in the gonads of male embryos. Our results suggest that amh, aromatase and sox-9 play a role in sex determination and gonadal differentiation. In male caiman embryos, ATZ exposure increased aromatase expression and altered the temporal expression pattern of amh and sox-9 evidencing an ATZ-induced disruption of gonadal developmental programming. Since the effects of ATZ are consistent across all vertebrate classes, the ATZ-mediated disruptive effects here observed could be present in other vertebrate species.

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Hormones and the Sex Ducts and Sex Accessory Structures of Reptiles

Cited by 8 publications

References 140 publications

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

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

Spermatogenesis in Sceloporus variabilis (Squamata, Phrynosomatidae): A non‐quiescent pattern

Disruption of the developmental programming of the gonad of the broad snouted caiman (Caiman latirostris) after in ovo exposure to atrazine

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