The uterus is comprised of a body and cervix. The cervix protrudes into the vagina. The uterus is held in position within the fascia pelvis pelvic condensations end, called ligaments. These ligaments include pubocervical, transverse. cervical ligaments cardinal ligaments and uterosacral ligaments. It is covered by a sheet-like fold of peritoneum, the broad ligament.
The uterus is essential in sexual response by directing blood flow to the pelvis and to the external genitalia, including the ovaries, vagina, labia, and clitoris.
Uterine reproductive function is to accept a fertilized egg that passes through the utero-tubal junction from the fallopian tube. It is implanted in the endometrium, and derives nourishment from blood vessels which develop exclusively for this purpose. The fertilized egg becomes an embryo, attaches to a wall of the uterus, creates a placenta, and develops into a fetus (gestation) until delivery. Due to anatomical barriers such as the pelvis, the uterus is pushed partially into the abdomen due to its expansion during pregnancy. Even during pregnancy the mass of a human uterus amounts to only about one kilogram (2.2 pounds).