Hypothalamus, anterior pituitary, ovary and uterus

Menstrual cycle (HPG axis) mnemonics

The hormone loop that runs the 28-day cycle.

The two halves

Estrogen builds the house, progesterone furnishes it

Who does what

FSH grows the Follicle, LH means Let go: ovulation

A mnemonic only sticks once you have used it. The quiz and the rebuild below both draw on these exact steps.