Abstract
At the anterior end of the embryo an opening called the stomodeum appears during the latter part of the first month of intrauterine life. The face is formed from five processes surrounding this opening: 1 frontonasal, 2 maxillary and 2 mandibular processes (Fig. 88). The mandibular processes grow medially, fuse and unite in the midline, forming the lower jaw or mandible. When a failure of fusion of these processes occurs, a fissure of the lower lip results. The fusion of the upper processes converts the single stomodeal orifice into the cheeks, the whole upper lip except the philtrum (the vertical groove in the middle of the upper lip), most of the upper jaw and the palate. The appearance of an olfactory pit divides the frontonasal process into a medial and 2 lateral nasal processes. The medial process forms the septum of the nose, the philtrum and premaxilla; the lateral processes form the side of the nose but take no part in the formation of the upper lip. By imperfect fusion various defects result, such as harelip, macrotoma, microstoma, cleft palate, etc.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 1985 Springer-Verlag New York, Inc.
About this chapter
Cite this chapter
Thorek, P. (1985). Face. In: Anatomy in Surgery. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8286-7_6
Download citation
DOI: https://doi.org/10.1007/978-1-4613-8286-7_6
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4613-8288-1
Online ISBN: 978-1-4613-8286-7
eBook Packages: Springer Book Archive