Xazmqilish nayining ikkilanishi Ichaknayining tug‘ma ikkilanishlari yoki ichaknayia’zolarining juftlanishi deb - embrional rivojlanish davrida ichak devorining noto‘g‘rishakllanishi natijasida ikkilangan kovakli ichak paydo bo‘lishi bilan kechadigan tug‘manuq songa aytiladi