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Fig. 1. Vestibular epithelia, zones and afferent classes in the rodent. Confocal
images have been combined to produce this picture of part of the vestibular
portion of the mouse inner ear. The tissue is stained with fluorescently
labeled phalloidin (yellow; labels hair bundles), as well as antisera to
calretinin (green; stains certain afferents and hair cells) and β-III
tubulin (red; stains afferents). Extracellular matrices have been removed to
expose the hair cells in three sensory epithelia: the cristae of the anterior
and horizontal semicircular canals and the macula of the utricle. The central
zones of the cristae and the striolar zone of the utricular macula are
outlined in red. At the bottom edge of the tissue is part of the vestibular
ganglion. The large ganglion somata that are brightly stained for calretinin
give rise to pure-calyx afferents to the central and striolar zones. Scale
bar, 50 µm.