scholarly journals Histological Development of Male Reproductive Organs in Microminipigs

2016 ◽  
Vol 44 (8) ◽  
pp. 1105-1122 ◽  
Author(s):  
Akihisa Kangawa ◽  
Masayoshi Otake ◽  
Satoko Enya ◽  
Toshinori Yoshida ◽  
Masatoshi Shibata
Keyword(s):  
Giant Cell ◽  
Sexual Maturity ◽  
Multinucleated Giant Cell ◽  
Reproductive Organs ◽  
Tubular Structure ◽  
Structural Development ◽  
Tubular Atrophy ◽  
Accessory Glands ◽  
Male Reproductive Organs ◽  
Sexually Mature

Microminipigs are becoming increasingly attractive alternatives for various experimental applications, such as general toxicology studies, owing to their manageable size. However, there are limited studies on the male reproductive organs of microminipigs, particularly on the histological aspects of sexual maturity. To clarify the development of male reproductive organs, 35 male microminipigs, aged 0 to 12 months, were used in this study. Histological and histomorphological evaluation was performed based on spermatogenic development, measurement of tubular structure in testes and epididymides, and histological progress of accessory glands. In addition, spontaneous testicular changes were quantitatively assessed. Histologically, male microminipigs sexually matured around 4.5 months of age, when spermatogenesis in testes and structural development in genital organs were completed. Spontaneous testicular changes occurred in all the animals investigated. Multinucleated giant cell was most commonly observed, followed by hypospermatogenesis and tubular atrophy/hypoplasia. However, the number of affected tubules was less than 1% in testes after 4.5 months of age, suggesting that the influence of these changes on evaluation of toxicity studies may be minimal. It is preferable to use sexually mature animals in toxicology studies; therefore, the information obtained by the present study will be helpful for future toxicity evaluations in microminipigs.

Reproduction in Sminthopsis-Macroura (Marsupialia, Dasyuridae) .2. The Male

1990 ◽  
Vol 38 (2) ◽  
pp. 207 ◽  
Author(s):  
PA Woolley
Keyword(s):  
Breeding Season ◽  
Sexual Maturity ◽  
Binding Capacity ◽  
Reproductive Activity ◽  
Reproductive Organs ◽  
Histological Changes ◽  
Accessory Glands ◽  
Sminthopsis Macroura ◽  
Sexually Mature ◽  
Androgen Levels

The breeding season of S. macroura extends from June to February, and individual males (both wild- caught and laboratory-reared) are capable of breeding over extended periods during the breeding season, and for up to three seasons, in the laboratory. Gross and histological changes in the reproductive organs and endocrine changes in relation to reproductive activity have been investigated. Males do not appear to reach sexual maturity until the season following that in which they were born, although spermatorrhoea may commence in the season of birth. Testis and epididymis weight of these males, which commence spermatorrhoea late in the season, approximates that of sexually mature males early in the season but androgen levels and the weight of the accessory glands are low in all males except during the early months of the season. The age at which spermatorrhoea commences ranges from 141 to 350 days. The minimum scrota1 width at which it commences is 7.9 mm and the minimum body weight, 14.0 g. The onset of spermatorrhoea is not a function of age or season and in S. macroura should be used with caution as an indicator of impending sexual maturity. Maximum corticosteroid- binding capacity (MCBC) generally exceeded corticosteroid concentration and no androgen-related fall in MCBC was evident.

Structure, histochemistry, ultrastructure and seasonal variations of the male prostatic complex in the black Myotis bat, Myotis nigricans (Chiroptera: Vespertilionidae)

2014 ◽  
Vol 26 (8) ◽  
pp. 1188 ◽  
Author(s):  
Ana C. Negrin ◽  
Mateus R. Beguelini ◽  
Cintia C. I. Puga ◽  
Caroline M. Christante ◽  
Larissa M. Bueno ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Reproductive Strategies ◽  
Reproductive Organs ◽  
Seminal Vesicles ◽  
Considerable Variability ◽  
Annual Reproductive Cycle ◽  
Paulo State ◽  
Accessory Glands ◽  
Wide Geographic Distribution ◽  
Sexually Mature

Chiroptera are one of the most diverse orders of mammals and a unique group within Mammalia that posses a wide geographic distribution and considerable variability in reproductive strategies. The aims of the present study were to characterise the male prostatic complex of the bat Myotis nigricans (Vespertilionidae) and evaluate seasonal variations in the prostatic complex of M. nigricans specifically. Twenty-three sexually mature specimens (four sample groups: winter, spring, summer and autumn) were subjected to macroscopic, microscopic, morphometric and ultrastructural analyses. The reproductive accessory glands of M. nigricans were found to be composed of a multilobed complex associated with the urethra and a pair of inguinal bulbourethral glands. The complex was composed of three bilobed prostatic regions (ventral, dorsolateral and dorsal) with no ampullary gland and seminal vesicles. This pattern of lobulation is very similar to that described for the prostate of rodents; however, it differs from that of other mammals and even other families of bats (e.g. Phyllostomidae and Molossidae). Each prostatic region in M. nigricans has unique and distinctive characteristics, which synchronise to establish the main reproductive peak of the species in summer. The data also indicated an asynchrony in the activity of primary and secondary reproductive organs in the annual reproductive cycle of M. nigricans in São Paulo State, Brazil.

scholarly journals Anatomy and Histology of Reproductive Organ of Male Guinea Pig As a Source of Learning

2017 ◽  
Vol 1 ◽  
pp. 9-18
Author(s):  
Elvira Mega Androma ◽  
Laela Umi Khasanah
Keyword(s):  
Guinea Pig ◽  
Prostate Gland ◽  
Reproductive Organs ◽  
Reproductive Organ ◽  
Student Response ◽  
Histological Structure ◽  
Accessory Glands ◽  
The Subject ◽  
Male Reproductive Organs ◽  
Readability Test

This study were aim to (1) describe the anatomical and histological structures of testicular organ, epididymis, vas deferens, accessory glands, and penis in guinea pig (2) develop learning media in the form of histological slides as well as anatomy atlas of male reproductive organs (3) examine the atlas of reproductive organs of male guinea pig as a source of learning. Slide were made using paraffin method with HE staining. The study revealed histological structure of the five guinea pig (Cavia porcellus) accessory glands, namely ampullary glands, seminal vesicles, prostate gland, bulbourethral gland, and preputial gland. In addition, guinea pig penis had a baculum on its base. The results of the student response test showed very good category with the percentage of 90,55%. The readability test had very good value from the subject expert (95,71%), media expert (81,66%), peer reviewer (88,07%) and biology teacher (81,51%). Overall, the atlas of the 'Anatomy of Male Reproductive Organs of Guinea Pig' had excellent quality and deserves to be used as a learning resource.

Intrauterine development, functions and diseases of male reproductive organs

2010 ◽  
Vol 151 (39) ◽  
pp. 1573-1579
Author(s):  
Ákos Jakobovits ◽  
Antal Jakobovits
Keyword(s):  
Reproductive Organs ◽  
Intrauterine Development ◽  
Male Reproductive Organs

A szerzők a központi idegrendszer, a tesztoszteron és származékainak szerepét tárgyalják a férfi nemi szervek méhen belüli fejlődésében. A férfi személyiségét meghatározó jellegzetességek először az emberi fejlődés magzati stádiumában jelentkeznek. Ezek kialakulása a gyermekkorban folytatódik. Pubertás után ezek növekvő mértékben válnak nyilvánvalóvá, és az egyén élete folyamán túlsúlyban maradnak. Az említett folyamatok mind a férfias fenotípust, mind a férfias magatartást befolyásolják. A tesztoszteron és származékai kontrollálják a férfi nemi szervek fejlődését. Hiányuk a női nemi jellegzetességek túlsúlyához vezet, a férfi nemi kromoszómakép ellenére. E jelenségek típusos példája a testicularis feminisatio klinikai képe. Jelen tanulmány különleges figyelmet szentel a reprodukciós szervek azon rendellenességeinek, amelyek a magzatokban ultrahanggal azonosíthatók. Ezen anomáliák legtöbbje antenatalisan hatásosan nem kezelhető. Azok a rendellenességek, amelyek a méhen kívüli életben sem gyógyíthatók, a terhességmegszakítás javallatát képezhetik, amennyiben ultrahangvizsgálattal a kora terhességben kimutathatók. Orv. Hetil., 2010, 39, 1573–1579.

scholarly journals Failed prey or peculiar necrolysis? Isolated ammonite soft body from the Late Jurassic of Eichstätt (Germany) with complete digestive tract and male reproductive organs

2021 ◽  
Vol 140 (1) ◽  
Author(s):  
Christian Klug ◽  
Günter Schweigert ◽  
Helmut Tischlinger ◽  
Helmut Pochmann
Keyword(s):  
Digestive Tract ◽  
Late Jurassic ◽  
Reproductive Organs ◽  
Mantle Cavity ◽  
Soft Body ◽  
Exceptional Preservation ◽  
Attachment Structures ◽  
Male Reproductive Organs ◽  
Marine Basins

AbstractAmmonoid soft parts have been rarely described. Here, we document the soft parts of a perisphinctid ammonite from the early Tithonian of Wintershof near Eichstätt (Germany). This exceptional preservation was enabled by the special depositional conditions in the marine basins of the Solnhofen Archipelago. Here, we document this find and attempt to homologize its parts with various organs such as the digestive tract, reproductive organs, the mantle cavity with gills, and the hyponome, with differing degrees of reservation. Alternative interpretations are also taken into account. We suggest that the soft parts were separated from the conch either taphonomically (following necrolytical processes affecting the attachment structures) or during a failed predation, where a predator (fish or coleoid) removed the soft parts from the conch but then dropped them. This find is interesting because it adds to the knowledge of ammonite anatomy, which is normally hidden in the conch. The reproductive organs show traces of what might have been spermatophores, thus supporting the hypothesis that the microconchs represented the males.

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