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Abortion

Spontaneous: A pregnancy loss during the first twenty weeks of gestation. Habitual: When a woman has had three or more miscarriages. Incomplete: An abortion after which some tissue remains inside the uterus. A D&C must be performed to remove the tissue and prevent complications. Missed: The fetus dies in the uterus but there is no bleeding or cramping. A D&C will be needed to remove the fetal remains and prevent complications. Therapeutic: A procedure used to terminate a pregnancy before the fetus can survive on its own. Threatened: Spotting or bleeding that occurs early in the pregnancy. May progress to spontaneous abortion.

Acrosome

The enzymes in a sperm's head that allows it to make a hole in the coating around an egg, penetrate and fertilise the egg.

Adhesion

Scar tissue occurring in the abdominal cavity, fallopian tubes, or inside the uterus. Adhesions can interfere with transport of the egg and implantation of the embryo in the uterus.