Vestibular hair cells (I & II)

Category

Balance

Function

Head rotation, linear acceleration, gravity

Quantity

~70,000–80,000 / ear; ~150,000 total

Density

Higher at crista periphery than center

Distribution

3 cristae + utricle + saccule per ear; both labyrinths

Relative Deployment

Notes

Type I : Type II ratio ~1–2.4 by organ and age. Cristae ~7.5–8k each; utricle ~27–33k; saccule ~16–19k per ear. Counts decline after mid-life.

Interacting Systems & Components

• Mechanoreceptor (broader category)
• Nervous System (vestibular signaling)