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Henry Gray (1825–1861).  Anatomy of the Human Body.  1918.
 
the olfactory pits, which indent the fronto-nasal process and divide it into a medial and two lateral nasal processes (Fig. 45). The rounded lateral angles of the medial process constitute the globular processes of His. The olfactory pits form the rudiments of the nasal cavities, and from their ectodermal lining the epithelium of the nasal cavities, with the exception of that of the inferior meatuses, is derived. The globular processes are prolonged backward as plates, termed the nasal laminæ: these laminæ are at first some distance apart, but, gradually approaching, they ultimately fuse and form the nasal septum; the processes themselves meet in the middle line, and form the premaxillæ and the philtrum or central part of the upper lip (Fig. 48). The depressed part of the medial nasal process

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