Answer:
At the beginning of the follicular phase, the lining of the uterus (endometrium) is thick with fluids and nutrients designed to nourish an embryo. If no egg has been fertilized, estrogen and progesterone levels are low. As a result, the top layers of the endometrium are shed, and menstrual bleeding occurs.
The anatomy in the female genitalia system compose of different parts and it would start with vulva and then would progresses upward up to the perineum which is the answer. Hope this is the right answer and would be of help.
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