Vestibulocochlear System
Vestibulocochlear System

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Vestibulocochlear System - sensation of sound; and also of head position and head acceleration - located within the petrous portion of the temporal bone - co chear system = auditory system - vestibular system = orientation of head - perception of linear acceleration (gravity) and sensation of rotational acceleration - vestibulocochlear nerve, and auditory and vestibular center s of CNS ( See CN VIII ) - ecto dermal otic pit, lateral to brainstem invag inates and separates from the overlying ectoderm, to become the epithelium of the endolymphatic space of the inner ear - ecto derm of second branchial cleft, invaginates to become ear canal and outer surfa ce of tympanic membrane - endo derm of the first pharyngeal pouch has an outpouching, becoming the Eustachian tube and middle ear - meso derm of 1 st and 2 nd branchial arches becomes auditory ossicles ▲ six week embryo anterior ▲ view from above ► posterior ▼ © auricula