Morphological and Morphometric Study of Blood Leucocytes from Chaetophractus villosus (Mammalia Dasypodidae)

Polini, Nélida Nora; Camina, Ricardo; Casanave, Emma Beatriz

doi:10.1007/s005800050028

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“…Armadillos, and particularly Chaetophractus villosus, present certain unique features which make them suitable for biomedical research such as a remarkable adaptability to laboratory conditions, capability to endure serial cardiac bleedings for in vivo haematological investigations Polini et al, 1999), a great development of olfactory neuroanatomical structures (García Samartino et al, 1987), relatively low body temperature (Casanave & Affanni, 1994), high resistance to hypoxia (Affanni et al, 1986(Affanni et al, , 1987 and low metabolic rate (Mc Nab, 1984).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure and morphometry of ovarian follicles in the armadillo Chaetophractus villosus (Mammalia, Dasypodidae)

Codón¹,

Estecondo²,

Galíndez³

et al. 2001

Braz. J. Biol.

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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.

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