Tertiary Follicle
The granulosa cells of the secondary follicle produce a fluid called follicular fluid. Once pools of follicular fluid form within the follicle, it is then known as a tertiary or vesicular follicle. Eventually the individual pools of follicular fluid merge to form a single fluid pool, called the antrum.
A tertiary follicle consists of:
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A primary oocyte surrounded the zona pellucida and granulosa cells
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Multiple layers of granulosa cells
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Individual pool(s) of follicular fluid or the antrum
Figure 1: Illustration of tertiary follicles inside an ovary.