part of part of orifice cochlear labyrinth helicotrema http://upload.wikimedia.org/wikipedia/commons/1/19/Gray923.png The part of the cochlear labyrinth where the scala tympani and the scala vestibuli meet. It is the main component of the cochlear apex. The hair cells in this area best detect low frequency sounds. UMLS:C0229512 Wikipedia:Helicotrema cochlear apex Scarpa's orifice NCIT:C32723 SCTID:279775003 UBERON:0008813 FMA:61275 apex of cochlea