ba a saba amfani da kalmar “maɓalli na hadi” a cikin adabin kimiyya na zamani. Mai yiyuwa ne a yi amfani da shi a baya don yin nuni ga membrane da ke kewaye da kwayar kwai bayan da kwayar halittar maniyyi ta hadu da shi, amma wannan ba kalma ce da aka saba karba ba a binciken nazarin halittu na yanzu. p>Gaba ɗaya, kalmar “hadi” tana nufin tsarin da kwayar halittar maniyyi ke haɗawa da kwayar kwai don samar da zygote, wanda shine matakin farko na haɓaka sabuwar halitta. Maɓallin da ke kewaye da ƙwayar kwai ana kiransa "membrane kwai," kuma bayan hadi ya faru, zygote zai iya kewaye da "envelope na hadi" ko "coat kwai," wanda shine Layer na sunadaran da sauran kwayoyin da zasu iya hana wasu. sperm cells from fertilizing the same egg.Idan kuna da wasu tambayoyi ko kuma idan akwai takamaiman mahallin da kuke son sani, don Allah ku sanar da ni kuma zan yi iya ƙoƙarina don samar da ƙarin bayani. /p>