Oogenesis: From Oogonia to Ovulation in the Flagfish,Jordanella floridaeGoode and Bean, 1879 (Teleostei: Cyprinodontidae)
| Autor: | Lynne R. Parenti, Adriana García-Alarcón, Mari Carmen Uribe, Harry J. Grier |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Germinal epithelium endocrine system medicine.medical_specialty media_common.quotation_subject 010603 evolutionary biology 01 natural sciences Oogenesis 03 medical and health sciences Internal medicine medicine Zona pellucida Ovulation media_common Germinal vesicle biology Jordanella floridae biology.organism_classification Oocyte Cell biology 030104 developmental biology medicine.anatomical_structure Endocrinology Animal Science and Zoology Vitellogenesis Developmental Biology |
| Zdroj: | Journal of Morphology. 277:1339-1354 |
| ISSN: | 0362-2525 |
| Popis: | We provide histological details of the development of oocytes in the cyprinodontid flagfish, Jordanella floridae. There are six stages of oogenesis: Oogonial proliferation, chromatin nucleolus, primary growth (previtellogenesis [PG]), secondary growth (vitellogenesis), oocyte maturation and ovulation. The ovarian lamellae are lined by a germinal epithelium composed of epithelial cells and scattered oogonia. During primary growth, the development of cortical alveoli and oil droplets, are initiated simultaneously. During secondary growth, yolk globules coalesce into a fluid mass. The full-grown oocyte contains a large globule of fluid yolk. The germinal vesicle is at the animal pole, and the cortical alveoli and oil droplets are located at the periphery. The disposition of oil droplets at the vegetal pole of the germinal vesicle during late secondary growth stage is a unique characteristic. The follicular cell layer is composed initially of a single layer of squamous cells during early PG which become columnar during early vitellogenesis. During primary and secondary growth stages, filaments develop among the follicular cells and also around the micropyle. The filaments are seen extending from the zona pellucida after ovulation. During ovulation, a space is evident between the oocyte and the zona pellucida. Asynchronous spawning activity is confirmed by the observation that, after ovulation, the ovarian lamellae contain follicles in both primary and secondary growth stages; in contrast, when the seasonal activity of oogenesis and spawning ends, after ovulation, the ovarian lamellae contain only follicles in the primary growth stage. J. Morphol. 277:1339-1354, 2016. © 2016 Wiley Periodicals, Inc. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text