Matsayin ci gaba na amfrayo na mutum

Kafin mako takwas na ciki, amfrayo yana tasowa, an sanya gabobinsa, kuma bayan wannan lokacin embryo yana da dukkanin jikin, sannan sai kawai ci gaban su ya faru. Yayin tsawon makonni takwas ana kiransa amfrayo, kuma bayan makonni takwas bana amfrayo ba, amma tayi, kuma lokacin tayi zai fara.

Matakan farko na ci gaba da amfrayo na mutum

Matakan farko na haɓaka amfrayo zai iya samuwa ta ranar. A rana ta farko da kwai a cikin bututun fallopian ya hadu da kwayar halitta da kuma mataki na farko - haɗuwa ya faru. Kashegari zygote mataki ya fara - kwayar halitta wadda take da nau'i 2 a cikin rami tare da jinsin chromosomes, bayan da aka hada da kwayar halitta tare da kwayar halitta guda daya da tsinkayyar tsirrai na diploid.

Wata rana bayan haka, tantanin halitta zai fara raba - mataki na kwaya ko murkushe fara, har zuwa kwanaki 4. Kowane tantanin halitta yana rabuwa har sai an kafa guda ɗaya daga cikin kwayoyin halitta tare da rami a cikin blastula. Daga cikin kwayoyin halitta a nan gaba ya kafa trophoblast (ciwon gaba) da kuma embryoblast (ɗan gaba).

Yayinda rana ta 7 ke tashi sai iska ta shiga cikin ramin mahaifa, inda ya fara ɓoye enzymes da ake bukata don farawa na gaba na gaba - embryo kafa , wanda har zuwa kwanaki 2.

Embryo bayan kafawa

Sakamakon gyaran kafa ne kawai zai haifar da ci gaba na ci gaban amfrayo - gastrula. Kwancen kwalloblastal guda daya ne ya juya zuwa zane biyu. Ana kiran lakaran amfrayo mai suna ectoderm kuma yana haifar da epithelium na fata da kuma sassan kwayoyin halitta. Wannan shine lokaci na bambancin jigilar embryonic.

Daga matsanancin Layer (endoderm) a nan gaba, dukkanin kayan da ke ciki na tayin (ciki, intestine, bronchi da huhu), da hanta da kuma pancreas. Wadannan layuka guda biyu sun lanƙwasa, suna samar da kumfa (amniotic - ruwan hawan amniotic na gaba da gwaiduwa - na farko don ciyar da amfrayo, sa'an nan kuma a matsayin kwayar jikin mutum).

Daga wannan lokacin (wanda ya ƙare a farkon makon 3 na ciki), ƙarshen lokaci na ci gaban amfrayo - organogenesis - fara.

Ba da daɗewa ba kafin wannan, ƙwararrun embryo, ta ectoderm ta rufe da amfrayo daga waje, kuma endoderm yana cikin ciki kuma yana shiga cikin bututu, ta zama gut. Amfrayo kanta an cire shi ne daga sassa masu haɓaka. Tsakanin jakar amniotic da yolk, an kafa wani Layer - da kwayar cuta, wanda zai haifar da kasusuwa da ƙuda na tayin.

Bayan makonni 4, an fara farawa cikin ɓangaren tayin. A mako na 6, zamu iya bayyana ka'idodin sifofin, har zuwa karshen 7th, zuciya da ɗakunansa an kafa, har sai dukkanin kwayoyin halitta, huhu, da kuma gabobin jiki sun ƙare. Da makon 9, dukkanin kwayoyin halitta da tsarin sun samo asali, sannan sai kawai bambancin su zai faru.