implantation of the fertilized ovum usually occurs on the wall of the uterus.
implantation of the fertilized ovum usually occurs on the wall of the uterus.
where does implantation of the fertilized ovum usually occur?
wall of the uterus
the reproductive function of the uterus is to accept a fertilized ovum which passes through the utero-tubal junction from the fallopian tube. the fertilized ovum divides to become a blastocyst, which implants into the endometrium, and derives nourishment from blood vessels which develop exclusively for this purpose. the fertilized ovum becomes an embryo, attaches to a wall of the uterus, creates a placenta, and develops into a fetus (gestates) until childbirth. 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 a kilogram (2.2 pounds).
uterus
heterotopic pregnancy









































a heterotopic pregnancy is a rare complication of pregnancy in which both extra-uterine (ectopic pregnancy) and intrauterine pregnancy occur simultaneously. it may also be referred to as a combined ectopic pregnancy, multiple‑sited pregnancy, or coincident pregnancy.









































section::::cause.









































in a heterotopic pregnancy there is one fertilized ovum which implants normally in the uterus, and one fertilized ovum which implants abnormally, outside of the uterus.









































section::::pathogenesis.
heterotopic pregnancy