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In embryology, the nasal placode (or olfactory placode) gives rise to the olfactory epithelium of the human nose. Two nasal placodes arise as thickened ectoderm from the frontonasal process. They give rise to the human nose, the philtrum of the upper lip, and the primary palate.
The nasal pits are oval shaped and they leave a raised margin which is divided into a medial nasal process and a lateral nasal process.
The medial and lateral nasal process of each placode gives rise to the nose, the philtrum of the upper lip and the primary palate.
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