part of part of zone of bone organ cochlear modiolus osseus spiral lamina lamina of modiolus cochleae MA:0001184 UBERON:0006724 spiral lamina FMA:77710 EMAPA:35622 osseous spiral lamina MESH:D013137 SCTID:361315008 lamina of modiolus of cochlea osseous spiral lamina of cochlea lamina modioli cochleae Wikipedia:Osseous_spiral_lamina The osseous spiral lamina is a bony shelf or ledge which projects from the modiolus into the interior of the canal, and, like the canal, takes two-and-three-quarter turns around the modiolus. It reaches about half-way toward the outer wall of the tube, and partially divides its cavity into two passages or scalae, of which the upper is named the scala vestibuli, while the lower is termed the scala tympani. spiral lamina of modiolus osseus cochlea