Auditory Sensory System Flashcards
Signals of speech
The auditory sensory system transmits auditory signals to the cortex
Cortex
the outer rim of the cerebrum that is responsible for all conscious thought and behavior
*Speech is understood and produced here
sources of speech sounds
Vocal folds, Lips, Tongue, Teeth, Palate, medium for air sound, Air
perturbations in the air
rarefactions and condensation
Spectrogram
Sound waves of speech transmit signals of frequency and intensity
Vestibular portion
Arises from vestibular nuclei complex in the pons and medulla
Cochlear (auditory) portion
Arises from the ventral and dorsal cochlear nuclei in the medulla
Vestibular nerve
Innervates vestibular system of inner nerve
Cochlear nerve
travels to the cochlea of the inner ear to form the spiral ganglia
Forebrain
I, II
Midbrain
III, IV
Pons
V, VI, VII, VIII (junction)
Medulla
IX, X, XI, XII
Conductive hearing loss
outer, middle
Sensorineural hearing loss
Inner, nerve, cortex
Basilar membrane
vibrates due to pressure
Cochlea
Coiled
Stereocilia
Key features for signal transduction in the hair cell
Place coding
Frequency information in the speech signal is transmitted to the cortex
Tonotopic
organization through the brain stem, thalamus, then to the primary auditory cortex in the temporal lobe
Temporal coding
passes along the basilar membrane
Auditory neuropathy
underlies some cases of auditory processing disorder
Sensory pathway
connection pathway for signal transmission
Cochlear nucleus
The first nucleus of the auditory pathway within the brain stem. Is the cochlear nucleus
superior olivary complex
region at which sound localization is registered
Auditory pathway
primarily sensory afferent
Association Cortex
Primary auditory cortex
