I was first told that my aorta is slightly dilated at 4.0 cm. There is some variation in the way the term aneurysm is used. For the thoracic aorta, most agree that at a diameter of 4.0 cm it has reached a size that is considered an aneurysm. The word dilated refers to the enlargement of the aorta.
Called also neonate and newborn. premature infant (preterm infant) one born before a gestational age of 37 completed weeks (259 days). The duration of gestation is measured from the first day of the last menstrual period and is expressed in completed days or weeks.
Pregnancy-events from fertizilation until birth. Conceptus-the developing offspring. Gestation period-from the last menstrual period until birth. From fertilization through the 8th week after fertilization is the embryonic period, the conceptus is known as the embryo. The fetal period extends from the 9th week after fertilization through birth, the conceptus is known as a fetus. Accomplishing Fertilization. Fertilization occurs when a sperm fuses with an egg to form a zygote. This usually occurs when the ovum is approximately 1/3 of the way down the uterine tube.