TD N°2
Neuroendocrine Control

Hypothalamic Level:
Secretion of GnRH.

Pituitary Level:
In response to GnRH:

FSH secretion during the follicular phase (Day 1 to Day 14).

LH secretion in response to GnRH before ovulation (Day 14).

Plasma Level:

FSH levels are maximal from Day 1 to Day 14.

LH levels peak on Day 14.

Progesterone levels are maximal just before Day 14.

Estrogen levels are maximal after Day 14.

Ovarian Level:

Follicle growth from Day 1 to Day 14: Estrogen production.

Ovulation occurs on Day 14.

Regression of the corpus luteum after Day 14: Progesterone production.

Uterine Level:

Endometrial thickness gradually increases from Day 1 to Day 14 under the influence of estrogen.

Maximum thickness during the post-ovulatory period from Day 14 to Day 28 under the influence of both estrogen and progesterone.

Menstrual bleeding begins on Day 28 due to a decrease in progesterone levels.