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By the upgrowth of the surrounding parts the olfactory areas are converted into pits, the nasal pits or olfactory pits, which indent the fronto-nasal process and divide it into a medial and two lateral nasal processes. ==Additional images== File:Gray45.png|Head end of human embryo of about thirty to thirty-one days. File:Gray46.png|Same embryo as shown in Fig. 45, with front wall of pharynx removed. File:Gray50.png|The roof of the mouth of a human embryo, aged about two and a half months, showing the mode of formation of the palate. File:Gray947.png|The head and neck of a human embryo thirty-two days old, seen from the ventral surface. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Nasal pit」の詳細全文を読む スポンサード リンク
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