پاورپوینت در مورد حاملگی چند قلو

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دسته بندی : پاورپوینت

نوع فایل :  .ppt ( قابل ویرایش و آماده پرینت )

تعداد اسلاید : 32 اسلاید

 قسمتی از متن .ppt : 

Multifetal pregnancy

Etiology :

More commonly fertilization of two ova with tow sperm double ovum or fratermal or dizygotic twins

About tow third.

A bout one third as often

One fertilized ovum divided into two similar structures, into a separate individual that we call it a single ovum – monozygotic or Identical twins

Either or both process may be involved in the formation of high number of fetuses .

Genesis of monozygotic twins

If division occurs within first 72 hours before the inner cell mass is formed and the outer layer of blastocyst is not commited to chorion , They will evolve two embryoes ,with diamniotic ,dichorionic monozygotic.

The frecuency 18-36%