The Federal Aviation Agency's name changed to the Federal Aviation Administration as it became one of several agencies (e.g., Federal Highway Administration, Federal Railroad Administration, the Coast Guard, and the Saint Lawrence Seaway Commission) within DOT (albeit the largest).
The endometrium is the tissue lining the inner cavity of the uterus (or womb). The uterus, a hollow organ about the size and shape of a pear, is found in a woman's pelvic region and is the organ where the fetus grows until birth. The upper part of the uterus is called the corpus; the lower, narrower part of the uterus is called the cervix. The cervix is the opening between the uterus and the vagina. The outer layer of the uterus is called the myometrium. The myometrium is thick and composed of strong muscles.
Save. The inner lining of the uterus is called the endometrium. The endometrium is the tissue to which a fertilized egg, or blastocycst, attaches for the duration of a pregnancy. The endometrial size varies throughout the menstrual cycle, but should be less than 8 mm in post-menopausal women.enstruation. The endometrium starts off as a thickened lining, sometimes measuring up to 15 mm in thickness. Menstruation occurs during the first week of the menstrual cycle. As the endometrium is expelled, it may vary in thickness and may have an irregular appearance on ultrasound.