Flashcards in 15a. Inner Ear, Hearing and Vestibular Function Deck (49)
What is the name of the eardrum?
What is connected to the tympanic membrane?
Name the auditory ossicles
What is the stapes connected to?
What does the eustachian tube connect the middle ear to?
What are the functions of the eustachian tube?
Drain fluid from the middle ear into the throat
What is impedance?
Resistance to movement
How is impedance combatted in the ear?
Energy from the large surface area of the tympanic membrane is concentrated onto the oval window
Lever action of the ossicles amplifies vibration
What comprises the vestibular apparatus?
3 semi-circular canals
What information is received by the vestibular apparatus?
What lobe does information from the vestibular apparatus go to?
What is mechanotransduction?
Sound waves are converted to nerve impulses by the displacement of fluid
What does pushing in of the oval window cause?
Movement of fluid in the scala vestibuli
What fluid is found in the scala vestibuli?
What cochlear labyrinth is connected to the round window?
What fluid is found in the scala media/ cochlear duct?
What is contained in the scala media?
Organ of Corti
What separates the scala vestibuli from the scala media?
Which membrane separates the scala media from the scala tympani?
What is the composition of perilymph?
Similar to CSF
What is the composition of endolymph?
What is found in the lateral wall of the cochlea?
What makes up the stria vascularis?
Capillaries and marginal cells
What is the function of marginal cells?
Maintain the resting potential of endolymph by maintaining high K+
What membrane lies above the hair cells of the Organ of Corti?
What happens when hair cells in the Organ of Corti are bent against the tectorial membrane?
Influx of K+
Depolarisation causes opening of voltage gated Ca++ channels
Glutamate is released
What does amplitude of a sound wave correspond to?
What is the normal hearing threshold?
What volume causes pain?