Organogenez chist ?

Badi ba okhir rasidani gastrulyatsiya dar janin uzvhoi markazi ba monandi, naychai asab, khorda, naycharuda paydo meshavand. Dar neshtarshaklho uzvhoi markazi ba chunin roh tashakkul meyoband (rasmi 7.4). Ektodermai tarafi takhtapusht kham gashta, ba novacha tabdil meyobad. Ektodermai jonibhoi chap va rost boshad, meafzoyad va boloi novacharo mepushonad. Novacha ibtidoi silsilai asab buda, ba ektoder ma furu meravad va pahluhoi on bo ham payvast meshavand.

Hamin tavr, naychai asab ba vujud meoyad. Az qismi digari boqimondai ektodermai ibtidoi pustparda paydo meshavad. Dar in zina janinro neyrula menomand. Qismi takhtapushtii entoderma, ki dar zeri asab joygir ast, az digar qismho judo shuda, pechutob mekhurad va tasmaero ba vujud meorad, ki onro khorda menomand.

Az qismi boqimondai entoderma, mezoderma va epitelyai ruda inkishof meyobad. Tafriqashavii minbadai hujayrahoi janin ba paydo shudani bargakhoi bisyori ozod, yane uzvu boftaho ovarda merasonad.