01:146:245 Lecture Notes - Lecture 7: Eustachian Tube, Cochlear Nucleus, Vestibular System

• School: Rutgers University
• Department: Cell Biology and Neuroscience
• Course: 01:146:245
• Professor: Professor Wilhelms

Document Summary

~is a longitudinal wave, has rarefactions and compressions of air molecules. ~has the qualities of a wave waveform, frequency, amplitude, phase. ~we can hear between 20 to 20k hz. ~outer and middle ears collect sound and amplify their pressure. ~in the inner ear, the sensory hair cells do biochemical processes to transduce sound. ~at the cochlear nucleus, the info diverges into a bunch of parallel pathways. ~cochlear output has a bunch of different targets in the brain. ~has pinna the cartilage/skin outgrowth most people call ear. ~concha is the conch shaped part of the cartilage, more proximal than pinna. ~auditory canal is a canal leading from outside environment up to surface of tympanic membrane. ~pinna, concha, and auditory canal gather sound energy and focus it on the eardrum. ~because the inner ear (where sound is transduced) is liquid, the middle ear has to accommodate for transition from air to liquid medium.