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Medial and lateral nasal processes shown on embryo. The medial nasal process (nasomedial) on the inner side of each nasal pit merge into the intermaxillary segment and form the upper lip, crest, and tip of the nose. [1] The medial nasal processes merge with the maxillary prominences. The lateral nasal process from each side merge to form the ...
The intermaxillary segment in an embryo is a mass of tissue formed by the merging of tissues in the vicinity of the nose.It is essential for human survival. It is primordial, since in the further development of the embryo this particular mass no longer appears, but parts of it remain in "the intermaxillary portion of the upper jaw, the portion of the upper lip, and the primary palate".
Nasal placodes originate on the frontonasal prominence from the ectoderm. They thicken and sink in to form Nasal Pits, which deepen to form the Nasal Sacs. At the same time, mesodermal cells proliferate around the placodes, and the sides of these swellings form the medial and lateral nasal prominences.
The medial nasal processes provide the crest and the tip of the nose, and the lateral nasal processes form the alae or sides of the nose. The frontonasal process is a proliferation of mesenchyme in front of the brain vesicles, [ 48 ] and makes up the upper border of the stomadeum.
The frontal process of the maxilla is a strong plate, which projects upward, medialward, and backward from the maxilla, forming part of the lateral boundary of the nose. Its lateral surface is smooth, continuous with the anterior surface of the body, and gives attachment to the quadratus labii superioris , the orbicularis oculi , and the medial ...
The nasal pits are oval shaped and they leave a raised margin which is divided into a medial nasal process and a lateral nasal process. [2] The medial and lateral nasal process of each placode gives rise to the nose, the philtrum of the upper lip and the primary palate. [2]
The body of the maxilla: pyramid-shaped; has an orbital, a nasal, an infratemporal, and a facial surface; contains the maxillary sinus. Four processes: the zygomatic process; the frontal process; the alveolar process; the palatine process; It has three surfaces: [5] the anterior, posterior, medial; Features of the maxilla include: [5]
The maxillary prominence forms the lateral wall and floor of the orbit, and in it are ossified the zygomatic bone and the greater part of the maxilla; it meets with the medial nasal prominence, from which, however, it is separated for a time by a groove, the naso-optic furrow, that extends from the furrow encircling the eyeball to the nasal pit.