Auditory And Vestibular Systems Flashcards
Function of the external ear
To funnel sound waves into the ear canal causing a vibration of the eardrum
Vibration of thr tympanic membrane causes what
It is magnified at the junction of the stapes it the inner ear to the cochlea and ultimately to the hair cells in the organ of corti which then go to the cochlear ganglion
What is the reflex involving the SON that protects the hair cells from damage and what cranial nerves are involved
???
What is the primary auditory cortex area number
41
Where is area 41 located
The transverse temporal gyri of heschl
What is the funcion of area 41
It is the auditory cortex responsible for the subjective experience of sound
What is the function of wernickes area
The interpretation of sound
Where do the central processes of the spiral ganglion neurons enter the CNS and synapse
The dorsal or vestibular cochlear nuclei int he dorsal and lateral rostral medulla
What are some of the nuclear groups involved int audition
The SON, nuclei of the lateral lemniscus and or the trapezoid body, and the inferior colliculus
How is the inferior colliculus involved in the pathway that always us to hear and interpret sounds
Inferior colliculus projects to the medial geniculate nucleus of the thalamus, which projects ipsilaterally to area 41 int he temporal lobe.
Conductive hearing loss
A loss in hearing due to some obstruction which prevents sound waves from reaching the cochlea
Sensory-neural hearing loss
Occurs when neurons or their processes are damaged in the PNS or CNS
Most unilateral lesions do not produce significant hearing loss
Unilateral lesions above the medulla which involve the auditory nuclei/pathway produce what
A bilateral diminution of hearing slightly more contralateral than ipsilateral but not deafness!!
What is the acoustic reflex
The way your brain prevents hair cells from being damaged in the cochlea via CN 5 and 7
Presbycusis
The accumulated loss of hair cells causing a decreased auditory acuity
