The Rete Testis of the Goat, a Morphological Study

Goyal, Hari O.; Williams, Carol S.

doi:10.1159/000146438

Cited by 12 publications

(8 citation statements)

References 12 publications

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“…Septal segments of rete tubules as those recorded in goat, bovines and cat were demonstrated in the present study [7,8,10]. These septal segments connect the terminal parts of the seminiferous tubules with the mediastinal rete [7].…”

Section: Discussionsupporting

confidence: 77%

“…These septal segments connect the terminal parts of the seminiferous tubules with the mediastinal rete [7]. In our opinion, the septal rete tubules represent a pathway for the drainage of the testicular lobules that have no direct contact with the mediastinum testis.…”

Section: Discussionmentioning

confidence: 82%

“…The spatial topography of the excurrent duct system of the mammalian testis has been described by several authors in horse, goat, bull, cat [6][7][8][9][10]. Amman et al described the connection between the seminiferous tubules and the efferent ducts in the stallion [6].…”

Section: Introductionmentioning

confidence: 99%

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The development of the intratesticular excurrent duct system of donkey (Equus asinus) from birth to maturity

Hh¹,

Mnk²,

Ae³

et al. 2017

Histol Cytol Embryol

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The testis of the donkey was completely descended into the scrotum around birth. It was covered by a thick tunica albuginea consisting of outer and inner fibrous layers in addition to middle vascular one. Discrete bundles of smooth muscle cells were demonstrated in the outer fibrous layer of the tunica albuginea. These cells give the tunica albuginea a contractile function, which may aid in sperm transport. The present study emphasized an irregular arrangement of the testicular lobules of the donkey during various stages of the postnatal life. Such arrangement does not allow some lobules to have direct contact with the mediastinum testis. The latter was located paraxially, toward the epididymal border and extended about two-thirds of the testicular length; it is thick at the head extremity and gradually faded out caudal wards. The connection between the seminiferous cords and the initial part of the straight tubules exhibited a sharp cut contact in neonates, but it demonstrated exfoliated supporting and germ cells, as well as crowded population of peritubular cells in suckling animals. In premature ones, the connection between the seminiferous tubules and straight testicular tubules was characterized by a peculiar structure appearance that attained more modification and development. This connection included two regions; terminal segment of the seminiferous tubule and a dilated initial part of the straight tubule. In mature stage, the terminal segment was composed of three regions with different cellular composition. The duct system of the donkey testis included the intralobular, interlobular, mediastinal and tunical segments in addition to the efferent ductules. From the seminiferous tubules to the efferent ductules, the lining epithelium was essentially the same in cellular composition; however these passages differed in size and configuration from region to another.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 82%

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The development of the intratesticular excurrent duct system of donkey (Equus asinus) from birth to maturity

Hh¹,

Mnk²,

Ae³

et al. 2017

Histol Cytol Embryol

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“…Orsi et al (1984) identified mediastinal part of rete testis in goats, the former yielded by union of seminiferous tubules while the latter were the large straight inter connecting canals as observed in the present study. Goyal & Williams (1987) observed three segments of rete testis in American goats i.e. septal, mediastinal and extra-testicular.…”

Section: Discussionmentioning

confidence: 89%

Postnatal Development of Testis in Gaddi Goat (Capra hircus)

et al. 2014

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SUMMARY:A study was conducted on the testicles of 30 male Gaddi goats, divided into 3 groups viz; prepubertal (0 day to 18 months), pubertal (<18 months to >5 yrs) and post-pubertal (>5 yrs) ages. The study revealed that the testis was covered by fibroserous tunica albuginia having outer fibrous layer and inner vascular layer with smooth muscle fibers at birth. The tunica albuginia continuously grew in thickness from prepubertal to postpubertal animals. The septula testis arising from the tunica albuginia, divided the parenchyma in lobules and converged at mediastinum testis. Few differentiated and undifferentiated Leydig cells were present in the intertubular spaces of neonates, which enormously increased in pubertal animals and replaced by fibroblasts in the postpubertal animals. The parenchyma comprised of solid sex cords in new born kids. These were converted into luminated tubules after 6 months of age and had clear cut tubuli contorti and tubuli recti leading to the mediastinum testis. In "0" day old kids, sex cords were filled with undifferentiated small cells located peripherally along the basement membrane and large primordial germ cells located centrally. By six months of age, latter started showing sign of degeneration and thus luminization of tubules started. Spermatogenesis startedin the seminiferous tubules of 12-18 months goat. In pubertal animals all the stages of spermatogenic cells and Sertoli cells were identified in the seminiferous tubules. The population of gonia cells and primary + secondary spermatocytes were 35% and 30% respectively. In postpubertal animals gonia cells were reduced to <30% and Primary + secondary spermatocytes were <20%. Many degenerating seminiferous tubules showed hyalinization, fibrosis and giant cells. The stroma and parenchyma ratio which was 35:65 at birth became 30:60 at 6 months, 25:75 at 12 months and 15:85 in pubertal and 20:80 in postpubertal animals. Increased stroma in last phase was associated with replacement of seminiuferous tubules by fibrous elements.

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“…While the morphology of the septal and mediastinal rete has been studied in depth in various species, including rats (Roosen-Runge, 1961;Leeson, 1962;Dym, 1976;Hermo and Dworkin, 19881, guinea pigs (Ladman and Young, 1958;Vitale-Calpe and Aoki, 1969;Fawcett and Dym, 1974), bulls (Sinowatz et al, 1979;Wrobel et al, 1978;Goyal, 19821, goats (Ezeasor, 1986;Goyal and Williams, 1987), horses (Amann et al, 1977), monkeys (Burgos et al, 1979), and man (Bustos-Obregon and Holstein, 1976;Roosen-Runge and Holstein, 1978;Lindner, 1982), similar information about the extratesticular rete is scarce. To our knowledge, the morphology of the extratesticular rete has been clearly illustrated only in man (Roosen-Runge and Holstein, 1978) and to some extent in the goat (Goyal and Williams, 1987). Even in these species, information on the topography and junctional relationships with the ductuli efferentes is lacking.…”

mentioning

confidence: 99%

Reexamination of the morphology of the extratesticular rete and ductuli efferentes in the goat

Goyal¹,

Hutto²,

Robinson³

1992

Anat. Rec.

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The morphology of the extratesticular rete and ductuli efferentes was reexamined in serial cross sections collected from the entire mass of the efferent ductules and in longitudinal sections collected from the partially unraveled efferent ductules. The extratesticular rete forms a 3-4-mm-long sac-like dilatation, which, within the head of the epididymis, has a wide lumen (up to 4 mm) and gives off along its length numerous evaginations, which, in turn, make connections with the ductuli efferentes. The latter is a mass of 16-18 ductules lined by three types of nonciliated cells: type II cells are characterized by dense, periodic acid-Schiff (PAS)-positive granules; type III cells are characterized by empty-appearing, PAS-negative vacuoles; and type I cells lack both granules and vacuoles. The distribution of the three types of nonciliated cells varies along the length. Whereas only type I cells are present in the beginning portion of the efferent ductule, type II cells predominate in the middle portion and type III cells in the distal portion (near the epididymis). The transition from one cell type to the other type is gradual; thus there are short segments along the length that share characteristics first for type I and type II cells and then for type II and type III cells. These results demonstrate that different nonciliated cell types are not randomly distributed in the epithelium of the ductuli efferentes but, instead, gradually differentiate from type I to type II to type III cells along the length of each efferent ductule. Factors controlling this differentiation remain to be studied.

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The Rete Testis of the Goat, a Morphological Study

Cited by 12 publications

References 12 publications

The development of the intratesticular excurrent duct system of donkey (Equus asinus) from birth to maturity

The development of the intratesticular excurrent duct system of donkey (Equus asinus) from birth to maturity

Postnatal Development of Testis in Gaddi Goat (Capra hircus)

Reexamination of the morphology of the extratesticular rete and ductuli efferentes in the goat

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