Under surface of the head of a human embryo about twenty-nine days old. (Frontonasal process labeled at center left.)
During the third week of embryonic development, 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).
- hednk-027—Embryo Images at University of North Carolina
- Flash animation at indiana.edu
- ent/30 at eMedicine
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