Frontonasal prominence

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Frontonasal prominence

Under surface of the head of a human embryo about twenty-nine days old. (Frontonasal process labeled at center left.)
Gray's	subject #13 67
Dorlands/Elsevier	p_36/12669829

During the third week 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).

By the upgrowth of the surrounding parts these areas are converted into pits, the olfactory pits, which indent the frontonasal prominence and divide it into a medial and two lateral nasal processes.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.