ANP 1106 Lecture Notes - Lecture 18: Tectorial Membrane, Afferent Nerve Fiber, Inferior Colliculus

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Joanne Savory

Document Summary

Vestibulocochlear: anatomy, external ear i. ii. iii. Tympanic membrane (eardrum: middle ear i. i. c. Bony labyrinth: filled with perilymph, contains the vestibule, the cochlea and the semicircular canals, vestibule: central egg-shaped cavity; two sacs surrounded in its perilymph i. Sacs: house equilibrium receptors (maculae); respond to gravity and changes in head position: cochlea: bony chamber that contains the cochlear duct (contains endolymph) and the organ of. Inner ear: scalas vestibuli and tympani to the cochlear duct (media) Impulses from cochlea spiral ganglion (in the periphery) cochlear nuclei (in the brainstem) From there to: superior olivary nucleus & inferior colliculus (auditory reflex centre) Then impulses pass to auditory cortex; auditory pathways decussate so both cortices receive input from both ears: maculae, sensory receptor for static equilibrium. Otolithic membrane: jellylike; studded with tiny caco3 stones (otoliths) Saccular hairs: vertical movement: equilibrium and orientation, vestibular apparatus.