The nasal placode (or olfactory placode) gives rise to the olfactory epithelium of the nose. Two nasal placodes arise as thickened ectoderm from the frontonasal prominence. During the fifth week of development the placodes increase in size. In the sixth week of development the centre of each placode grows inwards to form the two nasal pits. The invaginations will give rise to the olfactory epithelium that lines the nasal cavities.
Nasal pit shown as olfactory pit
|Gives rise to||olfactory epithelium|
|Latin||placoda nasalis, placoda olfactoria|
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