Intermaxillary Segment

As a result of medial growth of the maxillary prominences, the two medial nasal prominences merge not only at the surface but also at a deeper level. The structure formed by the two merged prominences is the intermaxillary segment. It is composed of (a) a labial component, which forms the philtrum of the upper lip; (b) an upper jaw component, which carries the four incisor teeth; and (c) a palatal component, which forms the triangular primary palate (Fig. 15.24). The intermaxillary segment is continuous

Nasal pit ,h

Maxillary . prominence f

Mandibular t-

prominence I. A

Nasal pit ,h

Maxillary . prominence f

Mandibular t-

prominence I. A

Frontonasal prominence

Ut Eye

Nasolacrimal groove

Frontonasal prominence

Nasolacrimal Groove
Nasal pit Lateral nasal prominence Medial nasal prominence

Nasolacrimal groove

Week Embryo
Figure 15.22 Frontal aspect of the face. A. 5-week embryo. B. 6-week embryo. The nasal prominences are gradually separated from the maxillary prominence by deep furrows. C. Scanning electron micrograph of a mouse embryo at a stage similar to that of B.

with the rostral portion of the nasal septum, which is formed by the frontal prominence.

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