The round ligaments of the uterus are two flattened bands that extend from each side of the uterus and pass through a tunnel in the abdominal wall (the inguinal canal) to attach the outer folds of skin at the opening of the vagina (labium majus). The ligaments help to stabilize the uterus and are composed of muscular tissue with some fibrous tissue ,blood vessels, lymphatics; and nerves enclosed by the lining of the abdominal cavity.
Rapid movement or rolling over during sleep may sometimes trigger sharp pains in the lower abdomen or groin caused by spasm of the round ligaments. The pains usually last a few seconds and do not cause harm to the fetus. Applying heat to the painful area and avoiding sudden movements has helped some women.
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