The frontonasal process is a swelling that appears over the developing brain in the embryo during prenatal development and forms the future:

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During the fourth week,the frontonasal process also forms as a bulge of tissue at the most cephalic end of the embryo and is the cranial boundary of the stomodeum.In the future,the frontonasal process gives rise to the upper face,which includes the forehead,bridge of the nose,primary palate,nasal septum,and all structures associated with the medial nasal processes.

The Frontonasal Process Is a Swelling That Appears Over the Developing