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The Endowment for Human Development
The Endowment for Human Development
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Multilingual Illustrated DVD [Tutorial]

The Biology of Prenatal Development




IBHAYOLOJI YANGAPHAMBILI KOKUBELETHWA KOMNTWANA

.Ndebele [Sindebele (Ndebele)]


National Geographic Society This program is distributed in the U.S. and Canada by National Geographic and EHD. [learn more]

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Chapter 40   3 to 4 Months (12 to 16 Weeks): Taste Buds, Jaw Motion, Rooting Reflex, Quickening

Phakathi kweemveke ezi-11 nezili-12, ubudisi be-fetus bayanda cishe nge 60%.

Iimveke eziyi 12 zikhomba ukuphela, Kweenyanga ezintathu zokukhulelwa.

Imizwa yangemlonyeni seyiphelele.
Ngesikhathi sokubelethwa, Imizwa yangemlonyeni izakuba selimini kwaphela naphezulu ngaphakathi emlonyeni.

Ukukhipha okungafuneki emzimbeni Kuthoma kusese ziimveke ezi 12 kuqhubeke iimveke ezi-6.

Okukhishwa kokucala ku-fetus kubizwa nge-meconium. Kunama enzymes wokugaya (digestive enzymes), amaphrotheni, namaseli afileko akhishwa lihlelo lokugaya.

Emva kwemveke ezi-12, Izitho zangaphezulu sezifike ebudeni obungalingana nezomzimba. Izitho zomzimba zangaphasi ziyakhula sezizokufikela ubude bazo.

Ngaphandle komgogodla Naphezulu kwehloko, umzimba woke we-fetus uyaphendula nawuthintwa kancani.

ukuhluka kokukhula okuya ngobulili kubonakala kokuthoma. Isibonelo, ama-fetus wesifazane abonisa ukusikinyeka komhlathi kanengi ukudlula wesilisa.

Nawufanisa nokubalekisa umzimba kwangaphambili, ukujabula komlomo kuyenzeka ukuphendukela kilokho okujabulisa umlomo nokuvuleka komlomo. Ukuphendulokhu kubizwa nge "rooting reflex" begodu kuyaqhubeka ngemva kokubelethwa, kunceda ingane ifumane ibele likamama ngesikhathi sokuncela.

Ubuso buyaqhubeka nokukhula lokha amafutha athoma ukugcwala imihlathi nokukhula kwamazinyo kuthoma.

Eemvekeni ezi-15, amaseli akha iingazi ayafika(blood-forming stem cells) aziphindaphinde ngaphakathi kwethambo. Amaseli weengazi amanengi enzakala la.

Nanoma ukukhambakhamba kuthoma Ku-embryo eneemveke ezi-6, okhulelweko uthoma ezwe ukukhambakhamba kwe-fetus hlangana kweemveke ezi-14 nezi-18. Ngokwesiko isenzeko lesi Sibizwa ukwenza msinyana (quickening).