The Spermatogenesis of Ichthyophis glutinosus (Linn)

Seshachar, B. R.

doi:10.1007/bf00401954

Cited by 29 publications

(25 citation statements)

References 21 publications

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“…The germ cell cysts in spermiogenesis remain embedded in a fatty matrix, which has no relationship to or bearing on the Sertoli cells. In the alternative view (Exbrayat, 1986a(Exbrayat, ,b, 2000Exbrayat and Dansard, 1994), what Seshachar (1936Seshachar ( , 1942a considered as fatty matrix is only hypertrophied cytoplasm of the basal Sertoli cell that connects to the basal aspect of the lobule. Our observation corroborates the views of Exbrayat (1986aExbrayat ( ,b, 2000 that portions of the Sertoli cells rich in lipid droplets, the so-called "filamentous matrix," are only apical portions of the Sertoli cells irrespective of the species.…”

Section: Resultsmentioning

confidence: 96%

“…Exbrayat (1986aExbrayat ( ,b, 2000 and Exbrayat and Dansard (1994) proposed two kinds of Sertoli cells, peripheral and central, the latter presumably discharged from the wall of the lobule and lying loose in the lumen. According to Seshachar (1936), the central cells are degenerate germ cells. In our observation, they are cells with irregular shapes and deeply staining densely heterochromatic nuclei.…”

Section: Resultsmentioning

confidence: 99%

“…The lobules are permanent entities and their epithelium, therefore, is responsible for producing the cysts in various stages of spermatogenesis. Efferent ductules connecting the collecting duct and the lumen of the locule have been shown in caecilians (Seshachar, 1936(Seshachar, , 1942aWake, 1968Wake, , 1977Wake, , 1995. Thus, spermatogenesis in the caecilians is not cystic in the strict sense.…”

mentioning

confidence: 92%

“…We hypothesized that Sertoli cells in the caecilian testis do not change in relation to the dynamic recruitment and transition of the germ cells and are permanent. However, we found in the literature (Seshachar, 1936) that 1) Sertoli cells in the caecilian testis are also dynamic and that newer cells arise as parafollicular cells, which later acquire a relationship with the wall of the lobule; 2) the parafollicular cells become the Sertoli cells; 3) the single germ cell surrounded by parafollicular cells develops into a cohort of spermatozoa; and 4) at one stage of spermiation the Sertoli cells of the cyst become detached from the lobule wall and lie floating in the matrix; they are evacuated along with the spermatozoa (Seshachar, 1942a,b;Bhatta et al, 2001). This does not correlate appropriately with the multiplicity of germ cell cohorts occurring within a lobule.…”

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confidence: 92%

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Sertoli cells in the testis of caecilians, Ichthyophis tricolor and Uraeotyphlus cf. narayani (Amphibia: Gymnophiona): Light and electron microscopic perspective

Mathew¹,

Oommen²,

George³

et al. 2003

Journal of Morphology

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The caecilians have evolved a unique pattern of cystic spermatogenesis in which cysts representing different stages in spermatogenesis coexist in a testis lobule. We examined unsettled issues relating to the organization of the caecilian testis lobules, including the occurrence of a fatty matrix, the possibility of both peripheral and central Sertoli cells, the origin of Sertoli cells from follicular cells, and the disengagement of older Sertoli cells to become loose central Sertoli cells. We subjected the testis of Ichthyophis tricolor (Ichthyophiidae) and Uraeotyphlus cf. narayani (Uraeotyphliidae) from the Western Ghats of Kerala, India, to light and transmission electron microscopic studies. Irrespective of the functional state of the testis, whether active or regressed, Sertoli cells constitute a permanent feature of the lobules. The tall Sertoli cells adherent to the basal lamina with basally located pleomorphic nuclei extend deeper into the lobule to meet at the core. There they provide for association of germ cells at different stages of differentiation, an aspect that has earlier been misconceived as the fatty matrix. Germ cells up to the 4-cell stage remain in the intercalating region of the Sertoli cells and they are located at the apices of the Sertoli cells from the 8-cell stage onwards. The developing germ cells are intimately associated with the Sertoli cell adherent to the basal lamina until spermiation. There are ameboid cells in the core of the lobules that appear to interact with the germ cells at the face opposite to their attachment with the Sertoli cells. Adherence of the Sertoli cells to the basal lamina is a permanent feature of the caecilian testicular lobules. The ameboid cells in the core are neither Sertoli cells nor their degeneration products.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 92%

mentioning

confidence: 92%

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Sertoli cells in the testis of caecilians, Ichthyophis tricolor and Uraeotyphlus cf. narayani (Amphibia: Gymnophiona): Light and electron microscopic perspective

Mathew¹,

Oommen²,

George³

et al. 2003

Journal of Morphology

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“…Unlike in frogs and salamanders, in the caecilians the different cysts in a lobule may differ in the progression of spermatogenesis. The caecilian testes provides a good model to study spermatogenesis because of the presence of what once was known as the "fatty matrix" or the "stroma" in lobules (Seshachar, 1936) but later identified as hypertrophied Sertoli cells which leave little lumen (Exbrayat, 1986a(Exbrayat, ,b, 2000Exbrayat and Dansard, 1994;Smita et al, 2003).…”

mentioning

confidence: 98%

Stages in spermatogenesis of two species of caecilians, Ichthyophis tricolor and Uraeotyphlus cf. narayani (Amphibia: Gymnophiona): Light and electron microscopic study

Mathew

Oommen

Jancy

et al. 2004

Journal of Morphology

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The sequential changes during spermatogenesis in the testis of two species of caecilians, Ichthyophis tricolor (Ichthyophiidae) and Uraeotyphlus cf. narayani (Uraeotyphliidae), of Western Ghats of Kerala, India, were traced using both histological techniques and transmission electron microscopy. The cell nests were assigned to stages in spermatogenesis based on the classification of van Oordt (1956, Thesis, Utrecht University). To the best of our knowledge, this is the first identification and ultrastructural description of stages in spermatogenesis in caecilians. The article illustrates not only the stages, but also the cell divisions, mitotic and meiotic, as specified. The observations indicate that, although caecilians have undergone considerable modifications in morphology and anatomy, including reproductive anatomy, in the context of a subterranean and concealed life, they appear to have conserved the typical amphibian pattern of spermatogenesis for the events of development of spermatids.

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Morphology and histology of the male reproductive tract of Caecilia thompsoni (amphibia: Gymnophiona)

Serrano‐Perez

Ramírez‐Pinilla

2020

The Anatomical Record

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We studied the male reproductive tract of individuals of different body sizes of Caecilia thompsoni to describe morphological characteristics in comparison to other Gymnophiona. The reproductive tract consists of paired testes segmented into chains of primary and secondary lobes, sperm ducts that empty to Wolffian ducts, the cloaca that receives the Wolffian ducts and possesses a phallodeum. Müllerian ducts are present and develop into paired glands that empty into the cloacal urodeum. Testicular secondary lobes contain lobules with cysts of the entire germinal cell line, whereas primary lobes, in the terminal ends of the chains, only have spermagonia, Sertoli cells, and connective tissue. The smallest individual examined (21 cm body length) was immature and only possessed a few testicular primary lobes. Once the individuals reach sexual maturity, the morphological characteristics are quite consistent at macroscopic and histological level among males of very different body sizes. The histological features of the Wolffian and Müllerian glands suggest a complementary secretory role between the two ducts. In the cloaca we found the propulsor muscle, venous sinuses, and blind sacs in the phallodeum, which differentiate C. thompsoni from other species of the genus. Despite these slight differences, the general morphological characteristics, both macroscopic and microscopic, of the reproductive tracts of adult males of C. thompsoni follow the pattern known for the reproductively active males of Gymnophiona.

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The Spermatogenesis of Ichthyophis glutinosus (Linn)

Cited by 29 publications

References 21 publications

Sertoli cells in the testis of caecilians, Ichthyophis tricolor and Uraeotyphlus cf. narayani (Amphibia: Gymnophiona): Light and electron microscopic perspective

Sertoli cells in the testis of caecilians, Ichthyophis tricolor and Uraeotyphlus cf. narayani (Amphibia: Gymnophiona): Light and electron microscopic perspective

Stages in spermatogenesis of two species of caecilians, Ichthyophis tricolor and Uraeotyphlus cf. narayani (Amphibia: Gymnophiona): Light and electron microscopic study

Morphology and histology of the male reproductive tract of Caecilia thompsoni (amphibia: Gymnophiona)

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