Fine structure of the bovine oocyte from the mature graafian follicle.

Nineteen oocytes aspirated from mature Graafian follicles of normally cycling cows in standing oestrus were studied. Oocytes were fixed in phosphate-buffered glutaraldehyde followed by exposure to osmium tetroxide and embedding in Epon 812. Oocytes could be classified into four types based on characteristics of nuclear components and distribution of organelles and inclusions. These types represented late maturational changes occurring shortly before ovulation. The close association of granulosa-cell processes in Type-I maturing follicular oocytes showed progressive signs of deterioration in other oocyte types. In all oocytes, numerous mitochondria with 'hood-like' appendages were observed. Single cisternae of endoplasmic reticulum

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