Obstetrics 255 a Multiple Pregnancy Hellin's rule Types of Twin DiZygotic MonoZygotic Identical

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0:00 Multiple Pregnancy
0:18 Hellin's rule
1:20 Twins
1:22 DiZygotic
BinOvular,
Superfecundation(2 ova from same menstural cycle but different time),
Superfetation(2 ova from diff cycle, animal)
Fraternal twins
DiChorionic DiAmniotic (D D)
4:23 MonoZygotic Twins Identical
DiChorionic diAmniotic (D D) - zygote divide within 3 days (before implant)
MonoChorionic diAmniotic (Mo Di common) - divide after implant
MonoChorionic monoAmniotic(Mo Mo) - divide after implant and amniotic sac (after 2w of zygote formed)
Conjoined twins(earlier called Siamese twins)

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Twin pregnancy videos
Part a ruclips.net/video/ciiAquCTkQw/видео.html
Part b ruclips.net/video/x_x4TY0xi-s/видео.html
Part c ruclips.net/video/35a9dGsMF1o/видео.html
Part d ruclips.net/video/7oXMYObOAE8/видео.html
Part e ruclips.net/video/fTxzOeXLsIw/видео.html

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