Mavhiki makumi maviri nemaviri ekuberekwa anoreva mwedzi wechitanhatu wekurera mwana. Nenguva ino chikwata chekutanga maitiro emitambo miviri yakapera, iyo panguva iyi inoenderera mberi kuvandudza. Kubvira zvino zvichienda mberi, mwana wemunguva yemberi akagadzirira hupenyu huripo.
Fetus pamasvondo makumi maviri nemasere
Nemavhiki makumi maviri nemaviri ekuberekwa, urefu hwemucheche hunenge masendimita 30, uremu kubva 600 kusvika 680 g.Zvangwana rako rinouya richiri shoma, asi rinoramba richiwedzera kuwanda, kuunganidza mafuta ehuni, anodiwa kuti thermoregulation.
Kukura kwekutora masvondo makumi maviri nemasere
Iyo fetus inoputika pamasvondo makumi maviri nemana, asi haikwanisi kuenzaniswa nekufema kwekuwedzera. Munguva iyi, fetus inotanga kubudisa munhu anogadzirisa muviri - chinhu chinopa kuvhura kwemapapu alveoli panguva yekufema.
Icho fetus ine hutano hwakaoma hunoitika, nguva yebasa uye kurara, kunzwa kwakanaka uye kuratidzwa. Panguva ino zvakakosha kutaurirana nevana vako remangwana, verenga nhau, teerera mimhanzi naye.
Iko kusviba kwema fetus pavhiki makumi maviri nemasere kunowedzera kuwedzera, sezvo inokura duku kana ichikura muchibereko. Iyo palpitation ye fetus pamasvondo makumi maviri yakanyatsorongororwa ne stethoscope inopetric. Kazhinji, iyo fetal heart rate munguva ino ndeye 140-160 kurova paminiti.
Ne ultrasound ye fetus pamusvondo we24 uno unogona kuona chiso chakakwana chemangwana mwana.
Fetometry ye fetus pavhiki 24 ndeyekuti:
- biparietal usinga 55-67 mm;
- ukuru hwema frontal-occipital 71-85 mm;
- musoro kukanganisa 201-237 mm;
- Bheri chikwata: 102 mm.
Urefu hwemarefu emapfupa emufusera pamasvondo makumi maviri ndewekuti:
- femur 40-48 mm;
- kunyorera 36-44 mm;
- shandura mapfupa 31-39 mm;
- mapfupa emumugumbo we 36-44 mm.
Ne ultrasound ye fetus pamasvondo makumi maviri nemasere, kupararira kweropa, chimiro chemukati, uye kukanganisa kwekuvandudzwa kunoongororwa.
Nzvimbo yakarurama yemucheche mubereki inenge yakatangwa pavhiki 24, iyo fetus inoratidzika pasi, ichibata pasi zvishoma. Asi mharidzo yemusoro ye fetus inoshanduka kusvika pavhiki yekubata pamuviri, apo nzvimbo yemwana inogadziriswa. Kana pane hutachiona huripo pamasvondo makumi maviri nemasere, haisi chikonzero chekugumbura, sezvo fetus inogona kuchinja nzvimbo yayo mukati mavhiki gumi anotevera.
Uhu hwemuviri hwakawedzera zvikuru pavhiki 24. Uterine hwaro hwave huri pamusana wenzara, saka dumbu rakamuka. Mwana weramangwana anowedzera, uye dumbu rinokura pamwe naro. Kukura kwemuviri panguva yekuzvitakura kunoenderana nekugadzwa kwemuviri, kuyerwa, kukwirira kwemukadzi uye kuti ndevei pamuviri.