Complex distribution patterns of voltage-gated calcium channel α-subunits in the spiral ganglion

► CaV1.3 and CaV3.3 were neuron-specific and tonotopically-distributed. ► CaV2.2 was neuron-specific and distributed uniformly along the tonotopic axis. ► CaV2.1 was localized to neurons and Schwann cells. ► CaV2.3 and CaV3.1 were localized to neurons, Schwann cells and compact myelin. ► CaV1.2 was localized to neurons, Schwann cells and putative loose myelin.