The macula of the utricle is a patch of sensory hair cells on the floor of the utricle, lying roughly horizontal when the head is upright. A layer of calcium carbonate crystals (otoconia) sits on top.
| Location | Floor of the utricle in the vestibule of the inner ear |
|---|---|
| Parts |
|
| Nerve Supply | Vestibular nerve (vestibulocochlear nerve) (utricular branch of superior division) |
| Blood Supply | Labyrinthine artery (usually from the anterior inferior cerebellar artery) |
Senses horizontal linear acceleration and head tilt.
Otoconia dislodged from the utricle are the source of benign paroxysmal positional vertigo. Utricle function is tested with ocular vestibular evoked myogenic potentials and the subjective visual vertical.
Positional vertigo caused by otoconia displaced from the utricular macula.
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