The Primary Nose and Palate in Human Embryo Development
The basic morphology of the face is created between the fourth and tenth weeks of human development by the formation and fusion of five prominences: an unpaired frontonasal process plus two maxillary swellings and two mandibular swellings of the first pharyngeal arches (Fig. 3.1). All five swellings appear by the end of the fourth week around a primitive blind cavity, the stomodeum or primitive mouth, separated from the pharynx by the buccopharyngeal membrane which ruptures on day 24.
KeywordsOlfactory Epithelium Pharyngeal Arch Vomeronasal Organ Mouth Cavity Olfactory Placode
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