A surface structure that is the narrowed downward continuation of the conchal space bounded anteriorly by the borders of the tragus, posteriorly by theantitragus, and along its lower lateral margins and inferior boundary by the connection between the first two. [ http://www.ncbi.nlm.nih.gov/pubmed/20082456 http://purl.obolibrary.org/obo/UBERON_cjm https://github.com/obophenotype/human-phenotype-ontology/issues/2274 http://en.wikipedia.org/wiki/Incisura_anterior_auris ]