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形增厚形成鼻板，然后发展成为额鼻隆起的下半部分。
Frontonasal prominence
英语例句库
英语百科
Frontonasal prominence
During the third week of embryonic development, two areas of thickened ectoderm, the olfactory areas, appear immediately under the fore-brain in the anterior wall of the stomodeum, one on either side of a region termed the frontonasal prominence (or process).
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