Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.
外胚层表面呈双边卵圆增厚板,然后发展为额隆起的下半部分。
Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.
外胚层表面呈双边卵圆增厚板,然后发展为额隆起的下半部分。
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