Interior of right osseous labyrinth. (Modiolus not labeled, but is represented at the axis of the spiral of the cochlea at the right.)
||Modiolus, columella cochleae
The modiolus is a conical shaped central axis in the cochlea. It consists of spongy bone and the cochlea turns approximately 2.5 times around it. The spiral ganglion is situated inside it.
This article incorporates text from a public domain edition of Gray's Anatomy.