<P> 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 '' . </P>
the intermaxillary segment formed by the fusion of the
tissues in the vicinity of the nose