They give rise to the nose, the philtrum of the upper lip, and the primary palate.

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 roof of the nasal cavity.

[2] The medial and lateral nasal process of each placode gives rise to the nose, the philtrum of the upper lip and the primary palate.

[2] This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)