The structures for the face stem from various primordia around the stomodeum that have arisen up to the tearing of the oropharyngeal membrane (stage 11, ca. 29 days, 11):
a medial sacculation in front of the oropharyngeal membrane as the primordium of the adenohypophysis.
the medial frontonasal process (processus frontonasalis) that soon forms a medial and a lateral nasal process on both sides and pushes the adenohypophysis into the stomodeum.
the bilateral mandibular arch (first pharyngeal arch) with a maxillary and a mandibular process.
In order to be able to study the individual facial structures in detail, please use the interactive diagram (726 kB) with a profile view of facial development.
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