Iveki ye-13 ekuphuculeni umtsalane ibaluleke kakhulu, ngeli xesha ukuba ubudlelwane bubekwe kwi-"child-child" system.
Makhe siqwalasele indlela umntwana ekhula ngayo ngeli xesha lokukhulelwa.
Placenta
Ngeli xesha, i-placenta iphetha ukubunjwa kwayo. Ngoku ujongene ngokupheleleyo nokuphuhliswa kwe-fetus, ukuvelisa inani elifanelekileyo lamahomoni we-estrogen kunye neprogesterone. Ubungakanani be-placenta bu malunga ne-16 mm. Kuyisithintelo esinzima kwizinto ezahlukahlukeneyo eziyingozi, kodwa ngexesha elifanayo lidlula i-carbohydrates, amafutha kunye nama-protein ayimfuneko kumntwana.
Ubunzima be-Fetal ngeveki 13 yokukhulelwa
Isiqhamo kwiiveki ezingama-13 sinomlinganiselo we-15 ukuya kwi-25 g kunye nobukhulu be-7 ukuya kwi-8 cm. Intliziyo yesidalwa esincinci ngosuku sele iqhube i-23 ilitha yegazi. Ekupheleni kweiveki ezi-13 ukuya kwezi-14 iziqhamo ziya kuba nobude be-10-12 cm, ubunzima be-20-30 g, kunye nobubanzi beentloko malunga no-3 cm.
Ukuphuhliswa kwezitho zomntwana kunye neenkqubo kwiveki yesi-13 ukuya kwe-14 yokukhulelwa
Uqala ngokukhawuleza ukuphuhliswa kwengqondo. I-Reflexes ibonakala: i-sponge yengane isontekile, izandla zinyanzeliswe zibe yimpu, ingaqala, i-grimace, idonse iminwe emlonyeni. Ixesha elithile isiqhamo sichitha ngamandla, kodwa ixesha elininzi lilala.
Ulusu olunomsoco nolusweleko luyaqhubeka lukhula, akukho zinyama ezinamafutha angaphantsi kwamanzi, ngoko ulusu lwabo lubomvu kwaye lubomvu kunye nemithambo encinane yegazi ebonakalayo phezulu.
Ukwakhiwa kwenkqubo yeethambo kuqhubela phambili. Kwiiveki ezingama-13, umntwana sele sele ene-thyroid enegulane ngokwaneleyo, ngenxa yokuba i-calcium iyafaka amathambo. Amathambo ezinyathelo ngokuthe ngcembe abe yinde, inkqubo yokuxhatshaza kwegazi kunye namathambo omgudu uqala, izimbambo zokuqala zivela, ukuqala kwamazinyo amabisi amabini.
I-fetus kwiveki ye-13 yokukhulelwa nayo inesimo sokuphefumula kakuhle. Usana luphefumula. Ukuba umntwana uqala ukubandezeleka ngenxa yokungabikho kwe-oksijeni, enye ye-amniotic fluid ingena emiphakeni yayo.
Ngeli xesha i-prostate gland iqala ukuphuhlisa kumakhwenkwe. Amantombazana azalisa i-germ cells. Izitho zesondo ziqhubeka nokuhlula ngakumbi nangaphezulu: i-tubercle yesini iya kuba yinde kwaye ibuye ibuye ibe yindoda okanye i-clitoris, iguqa phantsi. Ngaloo ndlela, i-genitalia yangaphandle iphuhliswe ngokwaneleyo ukuhlula intombazana evela kwinkwenkwe.
Kwamathambo wengane kukho i-villi, edlala indima ebalulekileyo kwinkqubo yokugaya nokukhuthaza ukutya. Iiseli zegazi ziqala ukwenza kwisibindi, umongo wethambo, kunye nesantya somntwana. Uphuhliso lweengxenye zokuqala ze-insulin luqala nge-pancreas. Umshini wezwi lomntwana uqala ukudalwa.
Umqondo wokuvumba ukhula - umntwana uyabamba ukuvumba kunye nokutya kwendlela umama asebenzisa ngayo. Ayikho yonke imenyu yomama enokuthanda kwakhe, kwaye uyakuthanda izitya ezithile. Iingcali zenzululwazi ziye zafumanisa ukuba xa umfazi emva kokubeleka utshintsha kakhulu ukutya, kunokubangela iingxaki ezithile ekunceliseni, ngenxa yokuba umntwana uhlala ecinga ngephunga elivayo.
Ngokubhekiselele kwimbonakalo yamanzi, ekugqibeleni izuza iimpawu ezingaphezulu kunye nangaphezulu. Intloko ye-fetus ayisaphinda icinezele isifuba, ibhuloho yeempumlo, iinqonga ze-superciliary, kunye neengqumbo zichazwe ngokucacileyo. Iindlebe zikwimeko yazo evamile. Amehlo asebenzisana, kodwa ahlanganiswa ngamaphephelo.
Uninzi lomsebenzi ekubekeni izitho ezisisiseko kunye neenkqubo zomzimba sele zenziwe, sekuyisikhathi sokwakhiwa kwemoya yemvakalelo. Ngeli xesha, inkunzi ihlala iphulaphule ize iqalise ukusabela kwiimpawu ezivela kwihlabathi langaphandle (ezibandayo, ezifudumele, ezomnyama, ezikhanyayo, izandi, ezithinta), ukuqonda izakhono ezintsha.