The retromolar space or retromolar gap is a space at the rear of a mandible, between the back of the last molar and the anterior edge of the ascending ramus where it crosses the alveolar margin.[WP].
Comment:
[taxon-note] "Retromolar gap is found in some Neandertals because they had midfacial prognathism. This caused the lower toothrow to move forward, which led to the retromolar gap.." xsd:string {source="Wikipedia:Neanderthal_anatomy", taxon="NCBITaxon:63221"}