Auditory Systemt Flashcards
Sound frequencies are detected between 20Hz to ____ Hz
20—20,000 HZ
3 structures of the ear:
Outer
Middle
Inner
Outer ear collects and conducts ___ waves to what membrane?
Sound waves
Tympanic membrane
2 muscles of the middle ear
Tensor tympani
Stapedius
Membrane of the middle ear
Tympanic
3 auditory ossicles are?
Malleus
Incus
Stapes
The bony labyrinth of the temporal bone in the inner ear contains what fluid?
Perilymph
The membranous labyrinth of the inner ear contains what fluid?
Endolymph
The cochlea takes how many turns around the modiolus?
2.5
The cochlea takes 2.5 turns around the ___
Modiolus
Scalia vestibuli and scale tympani are connected at the ___
Helicotrema
The scalp vestibuli and scala tympani are connected at the helicotrema and contain?
Perilymph
The organ of Corti is a ___ analyzer
Frequency
Organ of Corti contains ___ cells and ___ membrane
Hair cells
Tectorial membrane
Hair cells of organ of Corti are __ receptors
Mechanoreceptors
Hair cells of organ of Corti have 2 types of cell types
Stereocilia (microvilli)
Kinocilium
The bipolar cells of spiral ganglion are ____ sensory neurons
1st order
Cochlear nuclei are ___ sensory neurons
2nd order
The medial geniculate nucleus of thalamus is ___ sensory neuron
3rd order
The dorsal cochlear nucleus projects contralateral to the lateral ___
Lemniscus
The ventral cochlear nucleus projects bilaterally to _____ nuclei
Superior olivary
The ventral cochlear nucleus fibers form the ___ as they travel contralaterally
Trapeziod body
Transverse temporal gyri of Heschl contain the primary auditory cortex areas ___
41 and 42
Transverse temporal gyri of Heschl projects the the auditory association cortex, area ___
22
Hearing defects can be classified as ___ deafness and ___ deafness
Conduction
Sensorineural (perceptive)
Conduction deafness can be caused by:
Otosclerosis
Otitis media
Presbycusis is the most common type of hearing loss. Usually occurs with ___
Aging
Presbycusis results form degenerative disease of which organ?
Organ of Corti
Acoustic neuroma=
Schwannoma
Schwannoma is a ___ nerve tumor with symptoms of ___ and unilateral deafness
Tinnitus
