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Auditory System

All about how we hear things

TermDefinition
Parts of the Outer Ear Pinna, Auditory Canal, Tymphanic Membrane
Parts of the Middle Ear Ossicles (Three tiny bones called the Malleus, Incus, and Stapes)
Parts of the Inner Ear Semi-Circular Canals, Cochlea
Tymphanic Membrane Vibrates when a sound wave hits it causing the ossicles to move and the Stapes presses into the Oval Window
Oval Window The membrane of the Cochlea
Cochlea A swirl shaped structure filled with fluid and contains sensory receptor cells which react when the Stapes moves against the oval window
Basiliar Membrane A thin strip of tissue in the Cochlea contains the sensory receptor cells
Corti Sits on top of the Basiliar Membrane and includes three rows of outer cells and one row of inner hair cells
Sensory Receptor Cells Sense the vibrations and turn them into action potential or neural spikes
Neural Spikes Action potential that is transported along the auditory nerve to higher centers of the auditory pathways
High Frequency High Pitched
Low Frequency Low Pitched
Amplitude of A Sound Wave Associated with the loudness of a sound
Temporal Theory Frequency is coded by the activity level of a sensory neuron
Place Theory Suggests that different portions of the Basiliar membrane are sensitive to sounds of different frequencies
Monaural Cues One Eared Cues. Each Pinna interacts with sound waves differently which is crucial to locating sounds from different directions
Binaural Cues Two Eared Cues. Provides info on sound along a horizontal axis using different patterns of vibration on the eardrum
Interaural Cues A sound coming from the right side of your ears is more intense than the left ear
Interaural Timing The small difference in the time at which a given sound wave arrives at each ear
Congenital Deafness Deafness you are born with
Conductive Deafness Due to a problem delivering sound to the Cochlea
Sensorineural Hearing Loss The most common cause of hearing loss and is due to aging, head trauma, acoustic trauma, infections and diseases
Created by: edrag26
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