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The Biology of Prenatal Development




IBHAYOLOGI LEPHATSELENE NEKUKHULA KWEMNTFWANA LOSESESIBELETFWENI SENINA

.Siswati [Swati (siSwati)]


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

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Embryonic Development: 4 to 6 Weeks

Chapter 11   4 Weeks: Amniotic Fluid

Emavikini la-4 i-amniyoni lekhanya ngale igocotela i-embriyo esikhwameni lesigcwele lokusamantana. Lolokusamantana lokuvikelekile emagciwaneni, lokubitwa ngekutsi ngemantana e-amniyoni, kuvikela i-embriyo kutsi ingalimali.

Chapter 12   The Heart in Action

Njengalokulindzelekile, inhlitiyo ishaya cishe 113 wetikhatsi ngeliminithi.

Nyalo caphela kutsi inhlitiyo intjintja umbala ngalesikhatsi ingati ingena ibuye iphume emagunjini ayo leso naleso sikhatsi ishaya.

Inhlitiyo itawushaya cishe tikhatsi let-54 wetigidzi ngembikwekutsi umntfwana atalwe futsi itawushaya ngetulu kwetikhatsi leti-3.2 wetigidzi tetigidzi ngekuhamba kwesikhatsi sekuphila lesiminyaka le-80.

Chapter 13   Brain Growth

Kukhula masinyane kwengcondvo Kubonakala ngekugucuka kwesimo sengcondvo lesembili, ingcondvo lesemkhatsini kanye nengcondvo lesemuva.

Chapter 14   Limb Buds

Ticubu tangenhla kanye neticubu Tangentasi ticalisa kukhula ngalesikhatsi kuvumbuka tigadlana teticubu emavikini la-4.

Ngalesikhatsi lesi sikhumba sibonakalisa ngale ngobe siyinhlayiya yinye kuphela ngebukhulu.

Ngalesikhatsi sikhumba siya ngekukhula, angeke sisabonakala ngale, lokusho kutsi sitawukhona kubona kukhula kwetitfo temtimba tangekhatsi lokungenani lenye inyanga kuphela.

Chapter 15   5 Weeks: Cerebral Hemispheres

Emkhatsini wa-4 na-5 wemaviki, ingcondvo iyachubeka ikhula masinyane futsi iyehlukaniseka iba tigaba let-5 letehlukile.

Bukhulu benhloko benta lokungenai 1/3 webukhulu sebubonkhe be-embriyo.

Kuvela tinhlangotsi tebucopho, letikhula kancane kancane tize tibe tincenye tengcondvo letinkhulu kunato tonkhe.

Imisebenti legcina iphetfwe tinhlangotsi tebucopho ifaka ekhatsi kucabanga, kufundza, kukhumbula, kukhuluma, kubona, kuva, kunyakata ngekutifunela, kanye nekusombulula tinkinga.

Chapter 16   Major Airways

Eluhlelweni lwekuphefumula, kukhona sicu semphimbo lesikhulu sasekudla nesasesincele futsi sitawugcina sihlanganise chochocho kumbe bhongwane, nemaphaphu.

Chapter 17   Liver and Kidneys

Buka liphaphu lelikhulukati leligcwele sisu eceleni kwenhlitiyo leshayako.

Tinso tesiphelane tivela emavikini la-5.

Chapter 18   Yolk Sac and Germ Cells

Sikhwama semtfubi welicandza sicuketse tinhlayiya letisetincane tetitfo tekutala letibitwa ngekutsi tinhlayiya letiyimbewana. Emavikini la-5 letinhlayiya letiyimbewana tiyatfutsa tiye etitfweni tekutala letiseceleni kwetinso.

Chapter 19   Hand Plates and Cartilage

Futsi emavikini la-5, i-embriyo imila tigadlana tetandla, kutsi ikhathilegi yona icale kwakheka emavikini la-5 1/2.

Lapha sibona sigadlana sesandla sesincele kanye nesihlakala emavikini la-5 nemalanga la-6.