Umbungu (okanye ibungu) ngumzimba okhulayo kumama. Ubume bombungu womntu uqhubeka nokufikelela kwiiveki eziyi-8 zokukhulelwa. Ngeli xesha, iqanda elichumayo lidlula indlela yokuphuhlisa kumzimba onayo yonke impawu ebalulekileyo yomntu. Kwaye emva kweveki ezi-8, umbungu ubizwa ngokuba ngumntwana.
Ukuphuhliswa kombindi womntu
Ngenkqubo yokuphuhliswa, imbungu yomntu idlula kwiinqanaba eziliqela (amaxesha): ixesha le-zygote, ixesha lokuqhekeka kwe-zygote , ukugaya, ixesha lokuzihlalisa kunye nokuphuhliswa kwezitho kunye nezicubu.
Ixesha le-zygote (i-unicellular embryo) lihlala lifutshane. Ngokukhawuleza emva kokufika kwinqanaba lokuchoboza amaqanda - oko kukuthi, ukuphindaphinda kweeseli ezibizwa ngokuba yi-blastomeres. I-Zygote isele ihlukaniswe endleleni ukusuka kwiphubhu ye-uterine ukuya kwisibeleko. Kwinqanaba lokugaya, i-embryythi inomqondiso we-system worror, i-musculature, i-axial skeleton.
Kwaye ke ukuphuhliswa kwazo zonke iinkqubo ezisisiseko kunye namalungu omntu ozayo. Ukususela kwi-ectoderm, isikhumba, iingqondo kunye nenkqubo yesantya yenziwe. I-epithelium yesitya sokugaya isuka kwi-endoderm, imisipha, i-epithelium ye-memous membranes kunye ne-genitourinary system esuka kumama-mesoderm, kunye ne-cartilage, i-connectif kunye namathambo e-bone, igazi kunye ne-vascular system.
Intliziyo yesibindi
Kwiveki yesi-4 yokukhulelwa, ukuqala kwentliziyo kuqala. Kuze kube ngoku, kubonakala ngathi ityhulow hollow. Ukunyakaza kokuqala kokuqala, intliziyo yokuqala ye-embryo ibonakala kwiveki yesi-5 yokukhulelwa.
Intliziyo iyaqhubeka nokuphuhlisa, kwaye kungekudala iya kuba yimilo emine-kunye ne-atria ezimbini kunye nama-ventricles. Oku kwenzeka ngeveki 8-9. Isakhiwo senhliziyo sihluke ngokusuka entliziyweni yendodana encinane. Ilinayo ifowuni ye-oval phakathi kwe-atrium ekhohlo kunye ne-right and bar in the middle between the aorta kunye ne-pulmonary artery. Oku kuyimfuneko ukubonelela umzimba wonke nge-oxygen ngokungabikho kozimeleyo
Ukuphuculwa kwembumbulu
Kwenzeka ukuba i-embryo igugile emva kwayo ekuphuhlisweni kwayo. Ukulahlwa kwe-embryo ukuvelisa kungabangela ukukhipha isisu. Ezi zinto zenzeka xa ama-embryus afikelele kwisigaba sokuphuhliswa komntwana, kwaye isizathu esona sihlandlo esingaqhelekanga sokusweleka kwamathambo si-chromosomal.
Imiba engundoqo yemingcipheko yimiba yomama kunye nokukhulelwa komzimba kunye nokukhipha isisu kwimbali yowesifazane. Akunakwenzeka ukuba ungabhekiseli kwimpembelelo yotywala kunye neziyobisi ekuphuhlisweni kwembungu - ezi zinto zingabangela ukulibaziseka kokuphuhliswa kwembungu kunye nokufa kwayo.