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.
Cervical Effacement refers to the cervix thinning out. The cervix starts out long and hard, and slowly diminishes as labor progresses. The cervix will become 100% effaced before the baby is born. Like cervix dilation, partial effacement may or may not be an early labor sign. You can start labor not being effaced at all, or you can be 50% effaced for a few weeks.