The spiral ligament is a thick band of connective tissue lining the outer bony wall of the cochlea. The basilar membrane attaches to it, and the stria vascularis lies on its inner surface.
| Location | Outer wall of the cochlear canal along its whole length |
|---|---|
| Parts |
|
| Nerve Supply | Cochlear nerve (no direct supply) |
| Blood Supply | Labyrinthine artery (usually from the anterior inferior cerebellar artery) |
Anchors the basilar membrane and helps recycle potassium ions needed for hearing.
Damage to the fibrocytes from noise, ageing or certain genetic conditions disrupts potassium recycling and contributes to hearing loss.
Gradual high-frequency hearing loss involving strial and spiral ligament degeneration.
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