Ultrastructure and morphometry of ovarian follicles in the armadillo Chaetophractus villosus (Mammalia, Dasypodidae)
Braz. j. biol
; 61(3): 485-496, Aug. 2001. ilus, tab, graf
Article
en En
| LILACS
| ID: lil-305157
Biblioteca responsable:
BR1.1
RESUMO
Ultrastructural and morphometric changes in oocyte and surrounding granulosa cells during armadillo follicular growth are described. Primordial, intermediary, early and late primary, secondary, tertiary and preovulatory Graafian follicles were found. From primordial to Graafian follicle, granulosa cells increase in height, become multilayered while fluid-filled spaces arise among them in the tertiary follicle stage. As the follicle expands the oocyte is located eccentrically and grows in size. From primordial to secondary stage organelles develop in number and complexity and many vesicles start arising in the cytoplasm at the secondary stage. From tertiary follicle stage the number of mitochondria decreases. In follicular cells, secreting-related organelles expand, but mitochondrial number decreases according to the follicle expansion. Intercellular junctions between both cell types increase. The morphometrical study shows a biphasic pattern of oocyte and follicle growth. The morphological baseline here provided will be essential for further comprehension of the reproductive biology in armadillos
Texto completo:
1
Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Armadillos
/
Folículo Ovárico
Límite:
Animals
Idioma:
En
Revista:
Braz. j. biol
Asunto de la revista:
BIOLOGIA
Año:
2001
Tipo del documento:
Article
País de afiliación:
Argentina
/
Brasil
Pais de publicación:
Brasil