Dermatopathology: An abridged compendium of words. A discussion of them and opinions about them. Part 5

FETAL: designates a period intra-uterine development that begins when the product of conception reaches a crown-rump length of 30 mm, usually by 55 or 56 days after fertilization, and ends at the moment of birth. The product of conception during this period is called a fetus. The period before fetal is embryonic, and the product of conception during that earlier period is termed an embryo. Formation of tissues and development of their functions occur mostly during the fetal period. FETUS: refers to the developing human or other animal, during the period in utero that extends from the end of the embryonic period, at the beginning of ninth week, to term. Many systems that began to develop in the embryonic period continue to advance during the fetal one. The rates of growth and gain in weight of a fetus are phenomenal. (SEE FETAL)