. Human embryology and morphology. Embryology, Human; Morphology. DEYELOPMENT OF THE FACE. 5 superior maxilla in the 3rd month of foetal life, the maxillae overlapping and almost completely excluding them from the face. The nasal spine is formed by the premaxillae. In mammals generally the premaxillae are highly developed and form the snout part of the face. In the higher Primates the face becomes less elongated, less prognathous and the premaxillae less developed. In the orang, for instance, the premaxillae are distinctly seen on the face at birth'(Fig- 5), but as the permanent canines begin
. Human embryology and morphology. Embryology, Human; Morphology. DEYELOPMENT OF THE FACE. 5 superior maxilla in the 3rd month of foetal life, the maxillae overlapping and almost completely excluding them from the face. The nasal spine is formed by the premaxillae. In mammals generally the premaxillae are highly developed and form the snout part of the face. In the higher Primates the face becomes less elongated, less prognathous and the premaxillae less developed. In the orang, for instance, the premaxillae are distinctly seen on the face at birth'(Fig- 5), but as the permanent canines begin to develop they fuse with the ant. nares. â left premaxilla âf^ / -JPâ maxilla canine. Fig. 5.âShowing the suture on the face between the premaxilla and maxilla in the skull of a young orang. In man each premaxilla is usually ossified by two centres, placed side by side. Hence it sometimes happens in cleft palate that the fissure appears, not between the canine and lateral incisor, but between the lateral and middle incisor. In such cases the two centres of the premaxilla have failed to unite and the cleft occurs between them. The two premaxillae unite together in the first year after birth. Their vestigial character in man is due to the small size of his masticatory apparatus and consequent retrogression in the development of the facial part of his skull. Naso-palatine Foramen.âThe naso-palatine foramina are formed where the mesial nasal and two maxillary processes unite to form the palate (Fig. 9). In animals with well-developed pre- maxillae the two naso-palatine (anterior palatine) foramina are large, and through each passes the naso-palatine duct, which allows a communication between the buccal and nasal cavities. The odour of the food within the mouth thus reaches the organ. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not pe
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
