intermandibularis apical supplementary element This class was sourced from an external ontology (amphibian_anatomy). Its definitions, naming conventions and relationships may need to be checked for compatibility with uberon A muscle slip arising from the lingual surface of the mandible on each side of the m. submentalis. The fibers pass posteromedially and attach upon the median raphe of the principal element (Tyler, 1971). UBERON:3010837