The osseous spiral lamina is a thin shelf of bone that winds out from the central core (modiolus) of the cochlea like the thread of a screw. The basilar membrane stretches from its edge to the outer wall.
| Location | Projecting from the modiolus into the bony cochlear canal along its 2.5 turns |
|---|---|
| Parts |
|
| Nerve Supply | Cochlear nerve fibres passing through it |
| Blood Supply | Labyrinthine artery (usually from the anterior inferior cerebellar artery) |
Partly divides the cochlear canal and carries nerve fibres from the hair cells to the spiral ganglion.
Cochlear implant electrodes are placed in the scala tympani beneath the lamina and must avoid damaging it to preserve remaining hearing. Fractures of the temporal bone can disrupt it.
Hearing loss from damage to cochlear structures or the cochlear nerve.
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