Uphuhliso osandul Human

Development of the Umbungu ngaphakathi kwisibeleko umfazi iquka lwamathuba amathathu.

Izigaba zophuhliso osandul.

Ixesha lokuqala uqala xa ukungena kulo zesibeleko em- iqanda kuze kuqhube kwiveki yokuqala. Ngelo xesha uphuhliso osandul lo mntu ubandakanya amalungu eziziiprayimari bookmark, ukuyilwa kweenkqubo extraembryonic ukuqinisekisa kamva ubukho mbungu yemfundo ngokupheleleyo kuzo zonke iinkqubo kunye namaziko.

Kuba nenkanuko iphambili isibeleko kwe iqanda ukuba isebenze ekukhuleni kwayo. layers iseli kwakhiwa - isiseko apho amalungu zangaphakathi ziya abunjwe kamva. Power iqanda ifumana ngokuthi ezinyibilikayo iiseli kumphezulu endometrium iiseli osandul. Ngoko ke, lo umbungu ihamba nzulu ukusetshwa aphephe kulo. ukufikelela ngokupheleleyo kudla akugqiba ngomhla weshumi elinesibini emva kokukhulelwa.

Ngaphezu koko, ubunzima yeseli uqala ukwandisa kakhulu, loo nto yahlulwe amaphepha amabini: yangaphakathi (endoderm) kunye langaphandle (ectoderm) igqabi osandul. Emva kokuba kwiveki yesithathu yokumitha kwakhiwa mesoderm - igqabi wesithathu, ephakathi nezinye ezimbini. Uphuhliso umbungu, ingakumbi, neziseko zayo zangaphakathi ngenxa ziya kwenzeka kwezi layers lwegciwane.

Le ectoderm sisiseko ukuze kwakhiwe wayesebenzisa yamazinyo, umphantsi nomphezulu yesikhumba, yoluvo (iindawo) kunye engundoqo (ingqondo kunye umnqonqo) luvo. Kwakhona mawubekwe qwa (emehlweni nokuva, iindawo ukuqgiba kunye gustatory omzimba).

Iseli Umaleko yangaphakathi (endoderm) yeyona isisiseko ukuze kwakhiwe iinkqubo bokuphefumla esiswini.

Mesoderm inxaxheba lokusekwa musculoskeletal, sentliziyo, excretory, kunye neenkqubo zokuzala.

uphuhliso osandul kwixesha lokuqala kuquka unikezelo iseli yabantu. Omnye wabo Ulobumba chorion - primary inwebu Palsy. Chorion villi ugcwele encinane kamva ezikhula ingaphakathi wesibeleko kwaye ngaloo ndlela zenze ngumkhaya. Enye inxalenye iseli inxaxheba ekudalweni amalungu extraembryonic.

Uphuhliso osandul lusishukumisela yabantu kwisigaba sesibini kwiveki yesibini. Oku kuthiwa ixesha osandul. Qhubeka eli nyathelo emva kweenyanga ezimbini yokumitha. Ngeli xesha, kukho ukuyilwa onke amalungu abalulekileyo.

Ngeli xesha lwakha imithambo yegazi ephambili. Emideni intloko iiseli umbungu angashenxela inxalenye phakathi engaphakathi langaphandle cell umaleko. Isiphumo usinga lwegciwane.

Enye ingongoma ebalulekileyo ixesha lesibini ukuyilwa ngumkhaya ukusuka chorion.

Ukususela kwiveki wethoba zokukhulelwa kunye de umntwana azalwe yokugqibela wesithathu - thole - xesha. Uphuhliso osandul Human ngeli xesha luphawulwa impumelelo lokuvuthwa ngokupheleleyo zonke izakhiwo lomzimba kwakhiwa.

Ukususela kwiveki yesithoba baqala ukuphuhlisa inkqubo yonyango. Imveliso enomfutho zamadlala eziyimfuneko ukuze zikhule. Eyona ibalulekileyo insulin. Ekupheleni kwenyanga yesithathu iphela kunye nokwanda ngumkhaya, nto leyo nayo ekuqaleni ukuvelisa iihomoni zalo.

Ukuya uphuhliso amasebe zobuchopho kuvuthwa aqukiweyo intshukumo lokuqala olungekazalwa.

imfundo amajoni omzimba iphela kwiveki weshumi elinesibhozo Palsy. omzimba womntwana enza iiseli ezimhlophe zegazi ukuphuhlisa. Obuvelisiweyo kunye namacandelo ezenza inkqubo kokuzalwa omzimba yosana olungekazalwa - interferon kunye immunoglobulin. Spleen uqala ukusebenza.

Utshintsho ibalulekileyo kule nkqubo pulmonary kwenzeka kwiveki ezingamashumi amabini anesine ngosuku. Ndiyila pouches yesiphelo ngalo kuba kungenzeka ukuba afeze umpefumlo.

Ngenyanga yesixhenxe sokukhulelwa kukho ukukhula izihlunu kunye namathambo umzimba, khon 'ukuze umzimba lo mntwana ufumana ngaphezu kwentloko yakhe.

Kwinyanga wethoba ukutyeba esebenzayo kwenzeka. Umntwana kweli xesha ibe ngokupheleleyo elide noqolileyo.