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

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)



Twin pregnancy videos
Part a    • Obstetrics 255 a Multiple Pregnancy Hellin...  
Part b    • Obstetrics 255 b Causes of Multiple Pregna...  
Part c    • Obstetrics 255 c Maternal complications of...  
Part d    • Obstetrics 255 d Fetal Baby complications ...  
Part e    • Obstetrics 255 e Diagnosis of Multiple Pre...  

law Triplet DiChorionic DiAmniotic
DiZygotic Twin (Two ova, two sperms) (Superfecundation,Superfetation(animals))(can be male and female) fraternal binOvulation
DiChorionic diAmniotic (D D)
MonoZygotic Twin - identical uniOvulation
DiChorionic diAmniotic (D D)
MonoChorionic diAmniotic (Mo Di common)
MonoChorionic monoAmniotic(Mo Mo)