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Embryology








            The critical development of facial

            structures begin at 4 to 5 week.
                                                            th





            There are 5 facial prominences around

            the stomatodeum including an unpaired

            frontonasal process, paired maxillary

            prominences and paired mandibular

            prominences






            The medial nasal processes fuses in the

            midline to form the upper lip while the

            mandibular processes fuse to form the

            lower lip














































                                          Illustration source: Nat Rev Genet. 2011 March; 12(3): 167–178
                                              http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3086810/
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