Morphological investigations on follicular atresia in canine ovaries |
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Authors: | Dr. Katharina Spanel-Borowski |
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Affiliation: | (1) Abt. für Klinische Morphologie, Universität Ulm, Postfach 4066, D-7900 Ulm, Federal Republic of Germany |
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Abstract: | Summary Morphologically, canine ovaries show two types of regression pattern in secondary follicles. In type A necrotic changes of the oocytes and the zona pellucida dominate, whereas in type B degeneration, necrobiosis and necrosis of the granulosa prevail. The atretic course of type B regression results in a pseudoantrum and leads, by pseudogrowth, to a structure imitating tertiary follicles. In both type A and type B regression, four consecutive stages of atresia are distinguished by light- and electron microscopy.True tertiary follicles display only one regression pattern which resembles type B of secondary follicles. Early, advanced, late, and terminal stages of atresia are again described. |
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Keywords: | Ovum (dog) Atresia Morphology |
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