The<unk>  is an embryological structure which gives rise to the lower portion of the face.
The mandible and lower lip derive from it.
It is innervated by the<unk>  nerve.
Mandibular prominence
Low nose bridge
Erlenmeyer flask deformity
Coarse facial features
Anodontia
Acrania
Hypodontia
Flattened nasal bridge