丂泱偺敪惗偼丆棏巕偲惛巕偺庴惛偵傛傝巒傑傝丆棏妱乮cleavage)偲嵶朎暘楐乮cell dividion)傪孞傝曉偟偰恑傓丏棏妱偼棏撪偺棏墿偺検偲暘晍偵傛傝丆摍墿棏乮isolecithal egg)偲抂墿棏乮telolecithal egg)偵暘椶偝傟傞丏
泱梩乮germ layer)
奜泱梩乮ectoderm)丗奜旂丆恄宱宯
拞泱梩乮mesoderm)丗懱峯暻乮暊枌乯丆崪奿宯丆嬝擏宯丆寢崌慻怐丆弞娐宯丆攔弌宯丆惗怋宯
撪泱梩乮endoderm)丗徚壔宯
懱峯乮body cavity, coelom)
丂挵懱峯乮enterocoel)
丂楐懱峯乮schizocoel)