When Does the Frontonasal Process?

SUMMARY: The external human face develops between the 4th and 6th weeks of embryonic development. Facial swellings arise on the frontonasal process (2 medial nasal and 2 lateral nasal processes) and the first pharyngeal arch (2 mandibular and 2 maxillary processes).

What does the frontonasal process form?

The frontonasal process rises from the neural crest and covers the forebrain. It will give rise to two medial nasal processes and two lateral nasal processes. ... The medial nasal processes develop medial to the nasal placode and will eventually fuse at the midline to form the inter-maxillary process.

Where is the frontonasal process located during development?

The frontonasal process gives rise to the upper face, which includes the forehead, brigade of nose, primary palate, nasal septum, and all structures associated with the medial nasal process.