PSYC 211 Chapter Notes - Chapter 7: Nucleus Raphe Magnus, Trigeminal Nerve, White Matter
22 Aug 2013
School
Department
Course
Professor
Document Summary
Stimulus: when object vibrates, causes air molecules to condense/rarefy, makes waves of 700 mph. if vibration btwn 30/20,000 times/sec, waves will stimulate receptor cells, be perceived as sound. Ear is analytical (not synthetic), because we hear both original tones instead of intermediate. Anatomy: sound goes through pinna (outer) through canal to tympanic membrane (eardrum), which vibrates. Middle ear: bones are ossicles, vibrate from tympanic. Malleus (hammer) links w/ tympanic and transmits vibration via incus (anvil) and stapes (stirrup) to cochlea: has receptors, part of inner ear. Baseplate of stapes presses against membrane behind oval window (opening in bones around cochlea). Organ of corti has hair cells anchored by. Deiter"s cells to basilar membrane; cilia pass through reticular membrane, ends link tectorial membrane. Waves caused basilar to more relative to tectorial, which bends cilia, makes potentials. Vibrations on oval window cause basilar to bend, det. by frequency. Auditory hair cells, transduction of auditory info: inner/outer cells of cochlear coils have cilia.
