Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.
外胚层面呈双边卵圆形增厚形成鼻,然后发展成为额鼻隆起的下半部分。
Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.
外胚层面呈双边卵圆形增厚形成鼻,然后发展成为额鼻隆起的下半部分。
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