Vaginal Ultrasound: Twin Pregnancy 8 weeks

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DrFloresBuissonManc
August 01, 2009

Enviado por " CONSULTORIO MÉDICO JAVIER FLORES BUISSON " MÁNCORA- PERÚ... URL: http://consultoriomedicoflo... ... Twin pregnancy Ultrasound of pregnancy at 8 weeks age, with identical (monozygoti...

Enviado por " CONSULTORIO MÉDICO JAVIER FLORES BUISSON " MÁNCORA- PERÚ...
URL: http://consultoriomedicofloresmancora... ...
Twin pregnancy Ultrasound of pregnancy at 8 weeks age, with identical (monozygotic) twins One gestational sac is seen with 2 yolk sacs visible inside it
This results from an early embryo dividing into 2 genetically identical embryos.
Yolk sac (small white circle in the left side of the sac) is a source of nutrients for the fetus
Fetus is too small to be seen this early.
multiple birth occurs when more than one fetus is carried to term in a single pregnancy. Different names for multiple births are used, depending on the number of offspring. Common multiples are two and three, known as twins and triplets. These and other multiple births occur to varying degrees in most animal species, although the term is most applicable to placental species.

Multiple birth siblings are either monozygotic or dizygotic. The former result from a single fertilized egg or zygote splitting into two or more embryos, each carrying the same genetic material. Siblings created from one egg are necessarily the same sex and are commonly called identical. Dizygotic or fraternal multiples instead result from multiple ova being ripened and released in the same menstrual cycle by a woman's ovaries, which are then fertilized to grow into multiples no more genetically alike than ordinary full siblings. Multiples called polyzygotic represent some combination of fraternal and identical siblings. For example, a set of triplets may be composed of identical twins from one egg and a third sibling from a second egg.
The most common form of multiple births for humans are twins. Many placental species give birth to multiples as a matter of course, with the resulting group called a litter.

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