Type I mammalian vestibular hair cell stereocilium

Type I mammalian vestibular hair cell stereocilia are specialized actin-filled projections located on the apical surface of type I vestibular hair cells in the inner ear. These structures form part of a "hair bundle" that is essential for mechanosensation—converting mechanical stimuli from head movement into electrical signals for balance and spatial orientation. Stereocilia are arranged in rows of increasing height and are connected by tip links; deflection toward the kinocilium opens mechanically gated ion channels at their tips, leading to depolarization and neurotransmitter release onto afferent nerve fibers[3][5]. Damage to these structures can result in permanent balance dysfunction because mammalian vestibular hair cells do not regenerate[4]. Stereocilia dysfunction is implicated in various hereditary and acquired inner ear diseases affecting balance[6].

Other names

Vestibular hair cell stereociliumStereocilia of vestibular hair cellsHair bundle (vestibular system)