| Registro completo |
| Provedor de dados: |
Zoologia
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| País: |
Brazil
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| Título: |
Histological characterization of cellular types during Scinax fuscovarius oogenesis (Lutz) (Anura, Hylidae)
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| Autores: |
Oliveira,Classius de
Santos,Lia Raquel de Souza
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| Data: |
2004-12-01
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| Ano: |
2004
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| Palavras-chave: |
Oocytes
Oogonia
Ovary
Pigment
Vitellogenesis
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| Resumo: |
This paper describes morphological characteristics of the ovarian germinative cells of the Scinax fuscovarius (Lutz, 1925). The ovary is organized in primordial germinative cells (oogonia) and follicular structures (ovarian follicle) - oocytes surrounded by follicular cells. Oogonia: their nests are peripherically localized, containing cells with large and oval nucleus. Oocytes I: basophilic cytoplasm; the spherical nucleus presents few nucleoli, one or two; the follicular cells (one tenuous layer) surround these previtellogenic cells. Oocytes II: the cell is larger and the cytoplasm becomes more basophilic; the nucleus presents few nucleoli and contains many chromosomes in the periphery (beginning the perinucleolar stage). Oocytes III: the cytoplasm acquires an intense acidophilia; the peripherical region of cytoplasm is filled with yolk and the internal region has no yolk at all; pigment synthesis begins; the follicular envelope presents three tenuous layers: an inner acellular (vitelline envelope) and two cellular layers (follicle cells). Oocytes IV: a characteristic of this stage is the differentiation between the animal and the vegetal poles; the nucleus in the animal hemisphere and the pigments give the oocyte a color dark brown; the vitellogenesis is intense and the yolk occupies the whole cytoplasm.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000400029
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| Editor: |
Sociedade Brasileira de Zoologia
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| Relação: |
10.1590/S0101-81752004000400029
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Zoologia v.21 n.4 2004
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| Direitos: |
info:eu-repo/semantics/openAccess
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