inner mental barbel Mental barbel that originates on the chin, in an anteromedial position relative to the outer mental barbel. The inner mental barbel is nearer to the mandibular symphysis than is the outer mental barbel. This class was sourced from an external ontology (teleost_anatomy). Its definitions, naming conventions and relationships may need to be checked for compatibility with uberon UBERON:2001969 ZFA:0005508 mental barbel