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inferior colliculus

(IC) Midbrain nucleus of the auditory pathway, that receives input from several peripheral brainstem nuclei and the auditory cortex. Auditory pathway 1. Cochlear nucleus 2. Superior olivary 3. Inferior colliculus 4. Medial geniculate 5. Primary auditory area of cerebral cortex The majority of the ascending fibers from the lateral lemniscus converge here, appearing as an integrative station and switchboard as well. It is involved in the integration and routing of multi-modal sensory perception, mainly the startle response and vestibulo-ocular reflex. It is also responsive to specific amplitude modulation frequencies and this might be responsible for detection of pitch. In addition, it detects spatial localization by binaural hearing. In Latin, inferior = lower, colliculus = hill. The inferior colliculi together with the superior colliculi form the eminences of the corpora quadrigemina, and also part of the tectal region of the midbrain.