Zera remakore ekuberekwa pamasvondo matatu ekugadzirisa kwevhiki ndeyevhiki imwe kubva pakutanga kwehutumbi hwose. Ivha, iyo yakasungwa zvakanaka, hairegi kugovana uye kutevera nzvimbo yekubatanidzwa kwayo. Iyo fetus muvhiki yechitatu yekuzvitakura ine maitiro emamerare, saka vamwe vanachiremba vanodana iyo morula.
Fetus pavhiki yechitatu yekuzvitakura
Zvishoma nezvishoma asi zvishoma nezvishoma, chimiro chema embryo chinowedzera, uye rutivi rwebhora rakagadzirwa ruzere nemvura. Iyo yakatarwa yakatarwa inosungirirwa kuti ibatanidzwe kurusvingo rweUterine, nechomukati mutsara inotarisirwa kuti ive embryonic disc. Imwe nguva gare gare embryo ichava yakawanda, muviri wayo uchawedzera uye kuwedzera muzasi. Pakubata pamuviri mumavhiki matatu uwandu hwomukomana huchaita kuti embryonic disk idzike mukati mehubhu, semugumisiro wekuti musoro unotanga kuumba kubva pamagumo ekupedzisira, uye kubva kune yakaoma-iyo coccyx. Zvepabonde masero anototanga kuumba.
Pamasvondo matatu, fetus inotanga kusungira kumadziro echibereko, iyo iyo blastocyst inobvisa hupamhi hwemasukisi, zvichiita kuti kuderera kuduku. Izvi zvinonziwo kushandiswa uye inotora maawa makumi mana. Munyika ino yose, mukadzi anogona kuchengeta kusakwana kwekubuda kweropa, izvo zvinowanzoitika.
Fetal size mumavhiki matatu
Mumavhiki matatu, uwandu hwemucheche hunoramba huchiwedzera, izvo zvinotungamirira kukuderera kwezvinyorwa zvemukati. Iye zvino pane nguva inouya apo anotanga kunyatsovimba nesimba remuviri wamai,
Ukuru hwema fetus pavhiki yechitatu yekuita muviri kunobatsira pakugadzirwa kwehomoni inokosha- progesterone . Ndiye iye anokonzera kugadzirwa kwehutachi uterine chaiyo, iyo ichazoguma yakaita sepentecenta - nhengo inokosha kwenguva pfupi. Uhu hwema fetus pamavhiki matatu hutachiwana hunenge 2 mm murefu. Inosanganisira inenge 250 masero, iyo inoramba ichiparadzanisa.
Mukadzi wacho kazhinji haafungi nezvemhando yemichero iri mumavhiki matatu, sezvo asingatombozivi nezvemamiriro ake matsva.