Inwardly rectifying potassium channel Kir4.1 is localized at the calyx endings of vestibular afferents

► Kir4.1 is expressed not only in glial cells but also in vestibular neurons. ► Kir4.1 is localized at the calyx endings which surround type I hair cells. ► Kir4.1 may play a role in the K+-buffering action of vestibular afferents. ► Expression of Kir4.1 gradually adopts a calyceal shape after birth.