superfetation


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superfetation

 [soo″per-fe-ta´shun]
the fertilization of an ovum and subsequent development of another embryo (fetus) when one is already present in the uterus, a result of fertilization of ova during different menstrual cycles, yielding fetuses of different ages.

su·per·fe·ta·tion

(sū'pĕr-fe-tā'shŭn),
The presence of two fetuses of different ages, not twins, in the uterus, due to the impregnation of two ova liberated at successive periods of ovulation; an obsolete concept.

superfetation

(so͞o′pər-fē-tā′shən)
n.
Formation or development of a second fetus when one is already present in the uterus, occurring normally in certain vertebrate species.

superfetation

[-fētā′shən]
Etymology: L, super + fetus, pregnancy
the fertilization of a second ovum after the onset of pregnancy, resulting in the simultaneous development of two fetuses of different degrees of maturity within the uterus. Also called superimpregnation.

superfetation

Obstetrics Fertilization and subsequent development of a 2nd ovum after the 1st has already implanted in the uterus; superfetation provides the theoretic explanation for the difference in times of delivery of fraternal 'twins'. Cf Superfecundation.

superfetation

The rare occurrence of two or more fetuses of different ages in a womb that are the result of fertilizations occurring in different menstrual cycles.

superfetation

the fertilization and subsequent development of an ovum when a fetus is already present in the uterus, a result of fertilization of ova during different ovulatory cycles and yielding fetuses of different ages.
References in periodicals archive ?
formosa by the combined effects of the plasticity of female size at maturity, matrotrophy, and superfetation in response to density.
However, to confirm a case of superfetation, doctors need to conduct chromosomal and metabolic tests on the babies after they are born.
Seemingly, superfetation is so rare that Boyle has heard of only 10 reported cases.
Superfetation occurs when eggs from two different menstrual cycles are released and fertilised separately.
articlekey=105927) Medicine Net , superfetation is "an extremely rare situation in which a pregnant woman becomes pregnant a second time with another (younger) fetus.
The process of superfetation has also been differentiated from "twinning" or "multiple gestation," as it involves the conception of an additional fetus during an established pregnancy.
Doctors suspect she has a rare condition called superfetation, which means conceiving when already pregnant.
Superfetation is extremely rare in humans, with only a handful of known cases - though it is more common in animals.
It was called superfetation - a condition more common in animals but almostunheard-of in humans.
Superfetation happens when eggs from two menstrual cycles are released and fertilised - so the foetuses aren't actually twins but siblings.