Menstrual Cycle

(Day 1-7) Menstruation (Period)

  • Endometrium Sheds → (lining of the uterus thickens with blood) → no fertilised egg


(Days 1- 13) Follicular phase

  • Brain will signal follicles to grow the egg

  • lining starts to thicken (endometrium)

  • Oestrogen rises to prepare for ovulation


(Day 14) Ovulation Phase

  • Follicle burst → Egg leaves ovaries → Fallopian tubes

  • Feamles or highly fertile

  • Mature egg is released


(Day 15-28) Luteal Phase

  • The follicle will turn into the corpus luteum

  • Produces progesterone - Prepares the uterine lining for a fertilized egg.

  • If no pregnancy → Progeterone levels drop → Oestrogen levels drop → PMS symptom

  • Starts the next period


Very Important Graph

Lining of the Uterus:

  • Day 0-7 Menstruation

  • From day 6 the endometrium is thickening

Ovarian Cycle:

  • Day 1-14 egg is growing

  • Day 14 Ovulation → the follicle burst and the egg is released down the fallopian tube.

  • Follicle turns into the Corpus Luetum → Releases progesterone → Promotes thickening of the endometrium

  • After day 28 everything begins to die → Hormones, Corpus Luetum, and endometrium

Artenior Puitary Hormones:

  • LH and FSH are 2 hormones released from the brain and are primarily responsible of ovulation/ the release of the egg.

Ovain Hormones:

  • Oestrogen → Primary hormone produced by ovaries helps promote the growth on the egg.