fetus /fe·tus/ (fēt´us) [L.] the developing young in the uterus, specifically the unborn offspring in the postembryonic period, in humans from nine weeks after fertilization until birth.
Fetus
fetus
fetus [fe´tus] (L.)
fetus
fetus
Patient discussion about fetus.
harlequin fetus an infant with a severe and usually lethal form of congenital ichthyosis, manifested by hyperkeratosis with rigid skin.
mummified fetus a dried-up and shriveled fetus.
fetus papyra´ceus a dead fetus pressed flat by the growth of a living twin.
parasitic fetus in asymmetrical conjoined twins, an incomplete minor fetus attached to a larger, more completely developed twin.
fe·tus (f  t s)n. pl. fe·tus·es 1. The unborn young of a viviparous vertebrate having a basic structural resemblance to the adult animal. 2. In humans, the unborn young from the end of the eighth week after conception to the moment of birth. |
Fetus
The term used to describe a developing human infant from approximately the third month of pregnancy until delivery. The term embryo is used prior to the third month.
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fetus
[fē′təs]
Etymology: L, fruitful
the unborn offspring of any viviparous animal after it has attained the particular form of the species; more specifically the human being in utero after the embryonic period and the beginning of the development of the major structural features, from the ninth week after fertilization until birth. Kinds of fetal anomalies include anideus, lithopedion, mummified fetus, parasitic fetus, and sirenomelia. Also spelled foetus. Compare embryo. See also prenatal development. fetal, foetal, adj.
fetus [fe´tus] (L.)
the developing young in the uterus, specifically the unborn offspring in the postembryonic period, which in humans is from the third month after fertilization until birth. See also embryo.
The stages of growth of the fetus are fairly well defined. At the end of the first month it has grown beyond microscopic size. After 2 months it is a little over 2.5 cm long, its face is formed, and its limbs are partly formed. By the end of the third month it is 8 cm long and weighs about 30 g; its limbs, fingers, toes, and ears are fully formed, and its sex can be distinguished.
After 4 months the fetus is about 20 cm long and weighs over 200 g. The mother can feel its movements, and usually the health care provider can hear its heartbeat. The eyebrows and eyelashes are formed, and the skin is pink and covered with fine hair called lanugo. By the fifth month the fetus's body is covered with a cheeselike substance (vernix caseosa), which serves to protect it in its watery environment. By the end of the fifth month it is 30 cm long, weighs 450 g, and has hair on its head. At the end of the sixth month it is 35 cm long and weighs 900 g, and its skin is very wrinkled.
After 7 months the fetus is 40 cm long and weighs over 1.3 kg, with more fat under its skin. In the male, the testes have descended into the scrotum. By the end of the eighth month it is 45 cm long, may weigh 2.3 kg, and has a good chance of survival if it is born at that time. At the end of 9 months, the average length of a fetus is 50 cm and the average weight is 3.2 kg. adj., adj fe´tal.
The stages of growth of the fetus are fairly well defined. At the end of the first month it has grown beyond microscopic size. After 2 months it is a little over 2.5 cm long, its face is formed, and its limbs are partly formed. By the end of the third month it is 8 cm long and weighs about 30 g; its limbs, fingers, toes, and ears are fully formed, and its sex can be distinguished.
After 4 months the fetus is about 20 cm long and weighs over 200 g. The mother can feel its movements, and usually the health care provider can hear its heartbeat. The eyebrows and eyelashes are formed, and the skin is pink and covered with fine hair called lanugo. By the fifth month the fetus's body is covered with a cheeselike substance (vernix caseosa), which serves to protect it in its watery environment. By the end of the fifth month it is 30 cm long, weighs 450 g, and has hair on its head. At the end of the sixth month it is 35 cm long and weighs 900 g, and its skin is very wrinkled.
After 7 months the fetus is 40 cm long and weighs over 1.3 kg, with more fat under its skin. In the male, the testes have descended into the scrotum. By the end of the eighth month it is 45 cm long, may weigh 2.3 kg, and has a good chance of survival if it is born at that time. At the end of 9 months, the average length of a fetus is 50 cm and the average weight is 3.2 kg. adj., adj fe´tal.
calcified fetus a dead fetus that has become calcified in utero; called also lithopedion.
fetus in fe´tu a small, imperfect fetus, incapable of independent life, contained within the body of another fetus.
harlequin fetus an infant with a severe and dramatic form of congenital ichthyosis, manifested by hyperkeratosis with rigid skin; death usually occurs in the first six weeks of life.
mummified fetus a dead fetus that is dried up and shriveled.
fetus papyra´ceus a dead fetus flattened by being pressed against the uterine wall by a living twin.
parasitic fetus in unequal twins, an incomplete minor fetus attached to a larger, more completely developed fetus (the autosite).
fetus
(fē´t
s),
n the structure present during the fetal period of prenatal development derived from the enlarged embryo.
s), n the structure present during the fetal period of prenatal development derived from the enlarged embryo.
fetus
[L.] the developing young in the uterus, specifically the unborn offspring in the postembryonic (see also embryo) period, after major anatomical structures have been outlined.
anomalous fetus
a fetus with one or more congenital defects.
calcified fetus
lithopedion; a fetus that has become calcified.
emphysematous/putrescent fetus
due usually to death of the fetus at parturition; the fetus has been dead for several days, decomposition has occurred and gas has been produced and can be palpated as subcutaneous crepitus; presents a major obstetrical difficulty because of the increased size of the fetus and its extreme dryness due to lack of fetal fluids. The conceptus has a putrid and persistent odor.
fetus in fetu
a small, imperfect fetus, incapable of independent life, contained within the body of another fetus.
mummified fetus
see mummification.
oversized fetus
commonly the result of very good feeding in the last trimester of pregnancy and often the cause of dystocia in beef heifers. See also fetal giantism.
fetus papyraceus
a fetus flattened by being pressed against the uterine wall by a living twin.
parasitic fetus
an incomplete minor fetus attached to a larger, more completely developed fetus, or autosite.
fetus
Obstetris 1. The unborn child developing in the uterus–after the embryonic stage, circa age 7 to 8 wks to birth 2. The product of conception from the time of implantation until delivery; if the delivered or expelled fetus is
viable, it is designated an infant. See Harlequin fetus, Nonviable fetus. Cf Embryo.
Patient discussion about fetus.
Q. Can the fetus hear through the womb? My wife wants to play music to our baby and put earphones on her pregnant stomach so he can hear it. Can he really hear the music?
A. Yes. The fetus can hear sounds from the 18th week of the pregnancy and during the 7th month his ears start responding to the sounds that reach him through the fluids of the womb. He can hear his mother's heart beats and vowel movements. From the third trimester he can even hear the noises from the street and outside world.
Q. In which month of pregnancy it's possible to determine gender of the fetus?
A. its usally done in the second trimester,or about 4 months.
Q. Is chicken pox dangerous to my fetus? I am pregnant and have never had chicken pox before. My daughter is 2 years old and has not had chicken pox before and hasn't been vaccinated against it either. If she does catch chicken pox can this be dangerous to me or the fetus?
A. If a pregnant woman who hasn't had chickenpox in the past contracts it (especially in the first 20 weeks of pregnancy), the fetus is at risk for birth defects and she is at risk for more health complications than if she'd been infected when she wasn't pregnant. If she develops chickenpox just before or after the child is born, the newborn is at risk for serious health complications. Therefore, it is advised that you vaccinate your daughter against chicken pox so she will not catch it and then could not pass it on to you.
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