part of part of in taxon develops from develops from contributes to morphology of Mammalia upper lip medial nasal prominence philtrum UBERON:0005402 lip philtrum EMAPA:17926 The vertical groove found on the median line of the upper lip, extending to the nose. FMA:59819 philtral region of upper lip Philtrum is modelled as the groove rather than the surface structure itself. https://github.com/obophenotype/uberon/pull/2691 EHDAA:9280 vestigial in humans. In humans, the philtrum is formed where the nasomedial and maxillary processes meet during embryonic development (colloquially known as Hulse lines). When these processes fail to fuse fully in humans, a cleft lip (sometimes called a 'hare lip') can result. A flattened or smooth philtrum can be a symptom of fetal alcohol syndrome or Prader-Willi syndrome infranasal depression Wikipedia:Philtrum VHOG:0000862 MA:0001577 medial cleft SCTID:362087004 EHDAA2:0001462 surface groove