Ib qho tshwm sim tsis tshua muaj tshwm sim, superfetation, lossis superfoetation, yog qhov tseeb tias tus poj niam cev xeeb tub thaum nws twb xeeb tub, tsuas yog ob peb hnub sib nrug. Tsuas yog kaum tus neeg mob tam sim no tau lees paub hauv ntiaj teb. Superfluous cev xeeb tub, ntawm qhov tod tes, muaj ntau dua hauv cov tsiaj, tshwj xeeb tshaj yog cov nas xws li luav.

Feem ntau, tus poj niam nres ovulating thaum nws xeeb tub. Superficiality yog qhov tseeb ntawm muaj ob lub ovulation, ncua los ntawm ob peb hnub. Yog li ntawd, peb tuaj yeem soj ntsuam ob qhov kev sib xyaw ntawm cov oocytes, uas tuaj yeem yog qhov tshwm sim ntawm ob txoj kev sib raug zoo: nrog tib tus khub lossis ob tus txiv neej sib txawv. 

Ob lub fetuses yuav cog rau hauv lub tsev menyuam thiab hloov zuj zus tom qab. Yog li ntawd lawv yuav muaj qhov hnyav thiab qhov ntau thiab tsawg. Qhov tshwm sim yog txhua yam tshwj xeeb tshaj plaws txij li kev hloov kho ntawm endometrium, tseem hu ua lub tsev menyuam hauv ob sab phlu, feem ntau tsis sib xws nrog kev cog qoob loo ntawm lwm lub qe hauv tsev menyuam. Tseeb tiag, nyob rau hauv cov hnub tom qab fertilization, nws yuav thicken nrog cov tsos ntawm cov hlab ntsha thiab hlwb los muab ib tug haum haum rau implantation.

Cov ntaub ntawv ntawm in vitro fertilization (IVF)

Hauv Fab Kis, thaum IVF, cov kws kho mob cog qhov siab tshaj plaws ntawm ob lub embryos uas nws lub hnub nyoog sib txawv ntawm D2 txog D4 piv txwv. Lawv lub sijhawm yuav raug ncua los ntawm ob peb hnub. Tom qab ntawd peb tuaj yeem hais txog kev xeeb tub superfluous.

Feem ntau, kev kuaj mob kom zoo yuav piav qhia qhov tshwm sim tshwj xeeb. Hauv kev tshawb fawb luam tawm xyoo 2008 los ntawm Phau ntawv Journal of Obstetrics thiab Reproductive Biology *, cov kws tshawb fawb tau muab tso rau ntau lub tswv yim: 

• Cov kab mob caj ces "zoo thiab / lossis ntau yam txhawb nqa cov placental ntau lawm ntawm hCG, tuaj yeem ua rau lwm qhov ovulation thiab tso cai rau cog"; 
• Muab ob npaug rau ovulation: qee zaum nws tshwm sim hauv cov poj niam ntawm kev noj tshuaj los txhawb kev yug menyuam; 
• Lub uterine malformation: xws li ib tug didelphic uterus, kuj hu ua ob lub tsev menyuam, piv txwv li.

Nyob rau hauv cov ntaub ntawv ntawm superficiality, peb tsis tuaj yeem hais txog cov menyuam ntxaib uas xeeb menyuam thaum muaj kev sib deev ib leeg. Monozygotic ntxaib yog tsim los ntawm tib lub qe cais nyob rau hauv ob lub sij hawm thawj 15 hnub tom qab fertilization. Nyob rau hauv cov ntaub ntawv ntawm dizygotic ntxaib, los yog "cov kwv tij ntxaib", peb saib muaj ob oocytes tau fertilized los ntawm ob spermatozoa nyob rau hauv tib daim ntawv qhia.

Qhov tsis tshua muaj neeg mob thiab tsis ntseeg ntawm qee tus kws kho mob tau pom qhov tshwm sim no, ua rau cev xeeb tub tsis yooj yim los kuaj xyuas. Ib txhia yuav tsis meej pem nrog dizygotic ntxaib cev xeeb tub.  

Nws yog feem ntau qhov kev loj hlob ntawm intrauterine retardation ntawm ib tug ntawm cov fetuses uas ua rau nws muaj peev xwm mus xav tias ib tug superficiality. Nws yuav yog ib qho tseem ceeb rau kev txiav txim siab seb qhov sib txawv ntawm qhov siab yog vim qhov txawv ntawm lub hnub nyoog gestational lossis yog tias nws yog ib qho kev loj hlob tsis zoo uas tuaj yeem yog cov tsos mob ntawm qhov txawv txav lossis teeb meem kev noj qab haus huv yav tom ntej. tus menyuam.

Raws li nyob rau hauv cov ntaub ntawv ntawm ib tug ntxaib yug, tus me nyuam ntawm thawj fetus yuav ua rau tus thib ob. Cov me nyuam mos yug tib lub sij hawm, txawm hais tias ib tug ntawm cov me nyuam mos yuav tsim me ntsis.