Morphological, Histological and Histochemical Studies on the Ovary of an Oviparous Caecilian, Ichthyophis beddomei (Peters)

Masood-Parveez, U.; Nadkarni, V. B.

doi:10.2307/1564907

Cited by 9 publications

(15 citation statements)

References 11 publications

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“…Germinal nests of I. supachaii randomly interrupt follicles along the entire ovary. This spatial organization is also found in the ovary of Chthonerpeton indistinctum (Berois and de Sá ), unlike in Typhlonectes compressicauda and I. beddomei , in which germinal nests arrange in an alternate (segmental) manner (Masood‐Parveez and Nadkarni ; Exbrayat ). However, progressive ovarian zonation is not present in I. supachaii , compared with C .…”

Section: Discussionmentioning

confidence: 79%

“…A,C,E). The oviduct is divided into three parts based on the histological structures: the anterior, middle and posterior parts, also called pars recta, pars convoluta and pars uterina, respectively (Masood‐Parveez and Nadkarni ). Upon transverse sectioning, all oviductal parts are composed of three tissue layers from the inside to the outside: epithelium, fibromuscular tissue and serosa (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Organization of the ovary of I. supachaii resembles that of other caecilians in forming a strand on each side, each containing separate entities of germinal nests and ovarian follicles (Berois and de Sá ; Masood‐Parveez and Nadkarni ; Exbrayat ). Germinal nests of I. supachaii randomly interrupt follicles along the entire ovary.…”

Section: Discussionmentioning

confidence: 99%

“…indistinctum , in which previtellogenic follicles are located at the periphery of the ovary and vitellogenic follicles are situated deep inside the ovarian tissue (Berois and de Sá ). In this report, oocyte/follicle stages are classified according to Masood‐Parveez and Nadkarni () and Exbrayat (). These stages include germinal nests of oogonia or primary oocytes, early and late previtellogenic follicles, early and late vitellogenic follicles and atypical or atretic follicles.…”

Section: Discussionmentioning

confidence: 99%

“…In lissamphibians, oogonia are located in discrete zones, known as germ patches for anurans and cell nests/germinal nests for urodeles and caecilians (Witschi ; Masood‐Parveez and Nadkarni ; Sharon et al . ).…”

Section: Discussionmentioning

confidence: 99%

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Microscopic structures of the ovary and female genital ducts of Supachai's caecilian, Ichthyophis supachaii Taylor, 1960 (Amphibia: Gymnophiona)

et al. 2015

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Pewhom, A., Chumnanpuen, P., Muikham, I., Chatchavalvanich, K. and Srakaew, N. 2015. Microscopic structures of the ovary and female genital ducts of Supachai's caecilian, Ichthyophis supachaii Taylor, 1960 (Amphibia: Gymnophiona). -Acta Zoologica (Stockholm) 00: 000-000.The structures of the female reproductive system (ovary, oviduct and cloaca) of Ichthyophis supachaii were investigated by dissection, histology and light microscopy. Paired, elongated, sac-like ovaries are parallel to the gut and fat bodies. Follicle stages include germinal nests of oogonia and primary oocytes, early and late previtellogenic follicles, early and late vitellogenic follicles and atretic follicles. Germinal nests of oogonia comprise oogonia and prefollicular cells. Nests of primary oocytes contain clusters of synchronously developing primary oocytes enclosed by connective tissue. Primary oocytes are associated with follicular cells. Previtellogenic follicles initially form the vitelline envelope, theca cell layers and patches of ooplasmic glycoproteins. Vitellogenic follicles contain heterogeneously sized spherical yolk granules. Atresia is present in several stages of developing follicles. The oviduct is divided into the anterior, middle and posterior parts. All oviductal parts are lined by non-ciliated epithelium. A small number of mucous cells are present in the middle part. The cloaca of female I. supachaii is divided into the anterior and posterior chambers. The anterior chamber is lined by glandular stratified columnar epithelium, while the posterior chamber has stratified cuboidal epithelium with less mucus production. Our results contribute to useful information on the reproductive biology of caecilians.

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Section: Discussionmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Microscopic structures of the ovary and female genital ducts of Supachai's caecilian, Ichthyophis supachaii Taylor, 1960 (Amphibia: Gymnophiona)

et al. 2015

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Oogenesis and the ovarian cycle inSalamandra salamandra infraimmaculata Mertens (Amphibia; Urodela; Salamandridae) in fringe areas of the taxon's distribution

Sharon

Degani²,

Warburg

1997

J. Morphol.

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Ultrastructural observations of previtellogenic ovarian follicles of the caecilians Ichthyophis tricolor and Gegeneophis ramaswamii

Beyo

Sreejith

Divya

et al. 2007

Journal of Morphology

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The ultrastructural organization of the previtellogenic follicles of the caecilians Ichthyophis tricolor and Gegeneophis ramaswamii, of the Western Ghats of India, were observed. Both species follow a similar seasonal reproductive pattern. The ovaries contain primordial follicles throughout the year with previtellogenic, vitellogenic, or postvitellogenic follicles, depending upon the reproductive status. The just-recruited primordial follicle includes an oocyte surrounded by a single layer of follicle and thecal cells. The differentiation of the theca into externa and interna layers, the follicle cells into dark and light variants, and the appearance of primordial yolk platelets and mitochondrial clouds in the ooplasm mark the transition of the primordial follicle into a previtellogenic follicle. During further development of the previtellogenic follicle the following changes occur: i) the theca loses distinction as externa and interna; ii) all the follicle cells become the dark variant and increase in the complexity of ultrastructural organization; iii) the nucleus of the oocyte transforms into the germinal vesicle and there is amplification of the nucleoli; iv) the primordial yolk platelets of the cortical cytoplasm of the oocyte increase in abundance; v) the mitochondrial clouds fragment and the mitochondria move away from the clouds, leaving behind the cementing matrix, which contains membrane-bound vesicles of various sizes, either empty or filled with a lipid material; vi) the perivitelline space appears first as troughs at the junctional points between the follicle cells and oocyte, which subsequently spread all around to become continuous; vii) macrovilli and microvilli develop from the follicle cells and oocyte, respectively; and viii) the precursor material of the vitelline envelop arrives at the perivitelline space. The sequential changes in the previtellogenic follicles of two species of caecilians are described.

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Morphological, Histological and Histochemical Studies on the Ovary of an Oviparous Caecilian, Ichthyophis beddomei (Peters)

Cited by 9 publications

References 11 publications

Microscopic structures of the ovary and female genital ducts of Supachai's caecilian, Ichthyophis supachaii Taylor, 1960 (Amphibia: Gymnophiona)

Microscopic structures of the ovary and female genital ducts of Supachai's caecilian, Ichthyophis supachaii Taylor, 1960 (Amphibia: Gymnophiona)

Oogenesis and the ovarian cycle inSalamandra salamandra infraimmaculata Mertens (Amphibia; Urodela; Salamandridae) in fringe areas of the taxon's distribution

Ultrastructural observations of previtellogenic ovarian follicles of the caecilians Ichthyophis tricolor and Gegeneophis ramaswamii

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