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Unformatted text preview: layers of encircling cells, now called granulosa cells. 3. The secondary follicle is distinguished by the presence of the antrum, a fluid-filled, central cavity. 4. In a mature (vesicular, or Graafian) follicle, the primary oocyte has completed meiosis I. It is the stage of follicular development that precedes ejection of the oocyte from the ovary (ovulation). The following features are observed: 1. The zona pellucida, a clear layer of glycoprotein, surrounds the oocyte. 2. The corona radiata, a ring of granulosa cells, encircles the zona pellucida. 3. Several layers of cells (theca cells) surround the granulosa cells. 5. The corpus luteum is the remains of the follicle following ovulation. It remains functional, producing estrogen, progesterone, and inhibin, until it finally degenerates....
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- Spring '10