Coloured scanning electron micrograph (SEM) of the surface of the inner sulcus in the organ of Corti in the cochlear of the inner ear. This area is lined with undifferentiated cuboidal cells. In the organ of Corti vibrations from sound entering the ear are amplified and converted into neural signals that are transmitted to auditory nerve fibres. Magnification: x3,000 when printed at 15cm wide.