uterus

a roughly pear-shaped organ within the cavity of the PELVIS that is specialized for the growth and nourishment of a FOETUS . FALLOPIAN TUBES connect to the upper part and the lower part joins the VAGINA at the CERVIX . It has a plentiful blood supply along with lymphatic vessels and nerves. During PREGNANCY it enlarges considerably and the smooth MUSCLE walls thicken. Contractions of the muscular wall push the foetus out via the vagina at childbirth. If there is no PREGNANCY , the lining undergoes periodic changes ( MENSTRUATION ).