Menstrual cycle

A period usually of 28 — 35 days in which oocytes are recruited, one is selected, which then matures and is released during ovulation to be caught by the tubal fimbriae and could then be fertilised by sperm. This fertilised egg becomes an embryo and moves along the fallopian tube so that on Day 5 of postfecundation and inblastocyst stage, it can nest in the endometrial cavity. If implantation takes place, the production of the pregnancy hormone starts and if it does not occur the endometrium is shed forming menstruation.