Xa iiveki ezi-21 zokukhulelwa zenzeka, i-anatomy ye-fetus iphantse ifana nesakhiwo somntwana emva kokuzalwa. Sekunayo zonke izitho zangaphakathi kunye neenkqubo, kwaye kwixesha elizayo kuphela ukuphuhliswa kwazo kunye nokukhula kuya kwenzeka. Kwaye ke iiveki ezingama-21 - ixesha lokuphela kwesicatshulwa sesi- ultrasound - isifundo apho zonke izitho zomntwana zivivinywa ukuvela kweentlungu zokuzalwa.
Iveki yokukhulelwa 21 - ukuphuhliswa komntwana
Kwiiveki ezingama-21 zokukhulelwa, ubunzima kunye nobukhulu bomntwana obuthathatyathwa abaqhelekanga ukulinganisa - ezi zibonakaliso ezingabalulekanga, nangona ubude bomzimba bufikelela kwi-18 cm kwaye ubunzima bufike ku-300 g.
Kuze kube lelo xesha, ibhinqa kufuneka live intshukumo yobusana , ukuba iiveki ezingama-21 zingekabikho-oku kungabangela ukukhathazeka.
Iveki yesi-21 - ukulinganisa ubukhulu bomntwana
Kwiiveki ezingama-21, ngokwemigaqo-nkqubo, phantse onke amathambo, izitho zangaphakathi kunye nobukhulu obukhethekileyo bomntwana obalwayo. Ubunzima bokuqala bokubhathela kwi-iveki yesi-21 yi-biparietal (51.6 mm phakathi kwamathambo amabini okwexeshana), ubukhulu besibini buyikhanga liyi-frontal-parietal (64 mm), ngelixa isakhiwo sengqondo sifana nesana olutsha.
Ngeveki 21, onke amathambo amathunga alinganiswa, ngeli xesha:
- ubude bethanga - 35.3 mm;
- ubude be-humerus - 33.5 mm;
- ubude be-tibia - 31.7 mm;
- ubude bamathambo engxowankulu i-29.5 mm.
Ububanzi besifuba kwiiveki ezingama-21 ngu-46.4 mm, ubukhulu bentliziyo ye-fetal buyi-21.2 mm ububanzi, ubude buka-21,5 mm ubude, kukho onke amagumbi entliziyo, ukusika kwayo, ngesantya se-120-160 ngomzuzu.
Umyinge wesilinganiso sesisu kwiiveki ezingama-21 ngu-52.5 mm, isisu sibonakala ngokucacileyo, izibilini zamathumbu azange zihluthwe, udonga lwangaphakathi lwesisu esiswini luphelile.
Ezi zibini zibonakala zifikelela kwi-20.3 mm ubude, i-11.1 mm ngaphesheya, izitya kunye neengxowa zengxowa azixulwanga, i-bladder encinci, i-pelvis encinci, emva kokuvuthwa kwe-fetus, iphantse ingabonakali.
I-Fetus ngeveki 21 yokukhulelwa
Isikhundla se-fetus sisoloko siyinhloko, kodwa nangona i-gluteal, ngeli xesha umntwana angaphenduka ngemini kwisibeleko, ngoko ke, de kube iiveki ezingama-30 zokukhulelwa, akufanelekile ukukhathazeka ngako.
I-placenta ifana, ububanzi obuyi-25.6 mm, ubukhulu bekholomu ye-amniotic fluid endaweni engahlawulelwayo kwiindawo zomntwana ovela kumntwana we-35 ukuya ku-70 mm. Umlomo wesibeleko uvaliwe ngeli xesha.