PSYCH 3A03 Lecture Notes - Temporal Bone, Vestibular System, Low Frequency
6 Sep 2013
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Document Summary
This outline summarizes major points covered in lecture. It is not intended to replace your own lecture notes. Semicircular canals part of vestibular system, but may also influence hearing because it shares fluid with inner ear. Semicircular canals open into vestibule, utricle, saccule, all involved in the sense of balance. Cochlea coil structure within temporal bone, is the primary auditory organ. Central spiral axis of cochlea is modiolus. Osseous spiral lamina spiral bony shelf that spirals along length of cochlea. Important to have system encased in bone for separation from other bodily sounds, and to keep entire system (from motion) so that it is sensitive to externally generations motion (sound) Helicotrema apical tip of cochlear duct. Consists of three chambers: scala vestibuli, scala media, scala tympani. Scala vestibuli and scala tympani are contiguous at helicotrema. Scala media (coclear duct) contains organ of corti. Oval and round windows located near cochlear base.
