SLHS 305 Test 1 Questions and Answers | New One | Grade A+

what are the two main functions of the outer ear (pinna)? Ans: sound localization and middle ear protection Where is the endolymph found and what charge does it have? Ans: in the scala media; positive charge Where is the scala vestibuli located? Ans: in the upper portion where does a low frequency sound start on the basilar membrane? Ans: low frequency sounds start at the apex where does a high frequency sound start on the basilar membrane? Ans: high frequency sounds start at the base what are the main roles of the ear canal? Ans: resonance characteristics of outer hair cells: Ans: 3-5 rows, test-tubed shaped, 12,500 in each ear, negative resting potential, cochlear amplifier where hairs expand and contract due to influx in K+ and effect the IHCs characteristics of inner hair cells: Ans: 1 row, flask-shaped, 3500 in each ear, stereocilia touch the tectorial membrane, negative resting potential, more involved in afferent nerve path to the CNS What contains the auditory cortex, Brodmann areas 41 & 42, and is the first station in the cortex responsible for processing sound