Spatial orientation in patients with chronic unilateral vestibular hypofunction is ipsilesionally distorted

Innervation of the vestibular organs is provided by two branches of the vestibular nerve: the superior branch receives input from the horizontal and anterior semicircular canal (SCC) and the utriculus, the inferior branch contains axons from the posterior SCC and the sacculus (Gianoli et al., 2005; Curthoys, 2010). Sudden unilateral peripheral-vestibular hypofunction (UVH) typically presents as acute vestibular syndrome (AVS) (Tarnutzer et al., 2011a), i.e., prolonged vertigo/dizziness accompanied by nausea/vomiting nystagmus, gait ataxia and motion intolerance, and may result from isolated superior vestibular neuropathy (SVN), inferior vestibular neuropathy (IVN) or a combination of both (CVN).

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