“…The endothelial eNOS is mainly involved in controlling vascular tone, but may provide a uniform background level of NO that determines the baseline levels of nearby neurones (Garthwaite, ). The nNOS has been identified in many stages of the auditory system, from the cochlea through the cochlear nucleus, superior olivary complex (SOC) and inferior colliculus to the auditory cortex (Baizer et al., ; Burette, Petrusz, Schmidt, & Weinberg, ; Coote & Rees, ; Eliasson, Blackshaw, Schell, & Snyder, ; Fessenden, Altschuler, Seasholtz, & Schacht, ; Fessenden, Coling, & Schacht,; Lee, Cho, Huh, Cha, & Yeo, ; Rodrigo et al., ). The presence of nNOS throughout the auditory system suggests that NO contributes significantly to auditory processing and that it does so in a number of ways.…”