Schematic of the postnatal Organ of Corti. The Organ of Corti consists of multiple cell types. Epithelial cells comprising the sensory inner (1) and outer hair (2) cells, and the supporting cells of Claudius (3), Hensen (4), Deiters (5), as well as inner (6) and outer (7) pillar, inner phalangeal cells (8), border cells (9) and cells of the spiral limbus (10). Vascular Endothelial comprising the blood vessels (11), Mesenchymal cells (12) and Neuronal cells from the spiral ganglion (13). Many of these cell type can be further sub-divided to additional sub-populations. The tunnel of Corti is 14.