Testicular Histomorphometric Parameters and Spermatogenic Dynamics of Monodelphis americana (Müller, 1776) (Didelphimorphia: Didelphidae)

ABSTRACT The testes of mammals are responsible for gamete production and the secretion of the sex hormone testosterone. Within the seminiferous tubules, spermatogenesis occurs, where germline cells undergo division and differentiation until the formation of spermatozoa. Meanwhile, in the intertubula...

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Vydané v:Anatomia, histologia, embryologia Ročník 54; číslo 4; s. e70047 - n/a
Hlavní autori: Martins, Ana Luiza Pereira, Dias, Fernanda Carolina Ribeiro, Rodrigues, Grasielle Avelar Vieira, Oliveira, Elizabeth Lopes, Araújo, Adriele Ribeiro, Avelar, Gleide Fernandes, Matta, Sérgio Luis Pinto
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Germany Wiley Subscription Services, Inc 01.07.2025
Predmet:
Animals
Body weight
Brazil
Cell differentiation
Endemic species
germ cells
gonadosomatic index
Leydig
Leydig cells
Leydig Cells - cytology
Male
Marsupials
Meiosis
mitosis
Monodelphis
Monodelphis - anatomy & histology
Monodelphis - physiology
Monodelphis americana
Parenchyma
Reproductive behavior
secretion
seminiferous tubule
Seminiferous Tubules - anatomy & histology
Sertoli
Sex hormones
species
Spermatogenesis
Spermatogenesis - physiology
Spermatozoa - physiology
Testes
Testis - anatomy & histology
Testis - cytology
Testis - physiology
Testosterone
Tubules
Brazil
spermatogenesis
Monodelphis americana
Leydig
seminiferous tubule
Sertoli
ISSN:0340-2096, 1439-0264, 1439-0264
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Shrnutí:ABSTRACT The testes of mammals are responsible for gamete production and the secretion of the sex hormone testosterone. Within the seminiferous tubules, spermatogenesis occurs, where germline cells undergo division and differentiation until the formation of spermatozoa. Meanwhile, in the intertubular compartment, Leydig cells produce and secrete testosterone, a hormone essential for spermatogenesis. Monodelphis americana is a marsupial species endemic to Brazil, commonly known as the three‐striped short‐tailed opossum. The reproductive biology of marsupials remains relatively unexplored despite being a crucial tool for understanding species‐specific reproductive strategies, which can aid in management and conservation efforts. In this study, M. americana exhibited a body weight of 36.7 g, with a gonadosomatic index (GSI) of 0.47%, a tubular somatic index (TSI) of 0.36% and an interstitial somatic index (ISI) of 0.27%. The proportion of seminiferous tubules was 83.16%, indicating a significant investment in sperm production. The mitotic and meiotic indices were 1.87 and 2.64 cells per division, respectively, with an overall spermatogenic yield of 12.68. The intertubular compartment accounted for 16.84% of the testicular parenchyma, of which 13.13% consisted of Leydig cells, with a total count of 22.75 × 106 Leydig cells per testis. The findings suggest that M. americana prioritises spermatogenic parameters over the intertubular compartment, implying that males exhibit a promiscuous reproductive behaviour.
Bibliografia:ObjectType-Article-1
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ISSN:0340-2096
1439-0264
1439-0264
DOI:10.1111/ahe.70047