Cochlear Duct

**Definition:** A spiral tube that is firmly suspended in the bony shell-shaped part of the cochlea. This ENDOLYMPH-filled cochlear duct begins at the vestibule and makes 2.5 turns around a core of spongy bone (the modiolus) thus dividing the PERILYMPH-filled spiral canal into two channels, the SCALA VESTIBULI and the SCALA TYMPANI.

**Tree numbers:** - A09.246.300.246.292

**Synonyms:** - Ductus Cochlearis - Scala Media