Ear Flashcards
Three divisions of the ear
Outer ear
Middle ear
Inner ear
Outer ear parts
Auricle
External auditory canal
Tympanic membrane
Auricle
Acts as a funnel for sound wave
(The ear)
Made of elastic cartilage
External auditory canal
Passageway through bone into the head
Contains ceruminious glands
Ceruminous glands
Modified sweat glands that secrete ear wax inside the external auditory canal
Tympanic membrane
The ear drum
Vibrates when struck by sound wave
Separates the outer and middle ear regions
Middle ear region parts
Cavity in skull’s temporal bone
Eustachian tube
Auditory ossicles
Eustachian (auditory) tube
Diagonal tube that connects middle ear to superior region of nasal cavity
Equalizes pressure
Auditory ossicles
Three tiny bones that vibrate when struck by sound waves
Auditory ossicle names
Malleus
Incus
Stapes
Malleus
Attaches to medial surface of tympanic membrane
Incus
Vibrates when struck by malleus
Median of the ossicles
Stapes
Vibrates when struck by incus and leads to inner ear region
Smallest of ossicles
The inner ear
Spiral shaped passageways deep in the ear
Neuron rich area that stimulates cranial nerve VII
Cranial nerve VII
Vestibulocochlear nerve
Terminated in brains temporal lobe
Cochlea
The spiral shaped bone in the inner ear
Three fluid filled membranes of the cochlea:
Cochlear duct
Scala tympani
Scala vestibuli
Cochlear duct
Triangular chamber that contains organ of corti
Organ of corti
Protrusion/bump inside the cochlea duct
Small elevation of neurons
Tectorial membrane
Finger like membrane next to the organ of corti
What attaches the organ of corti and tectorial membrane?
Cilia
Scala tympani
Chamber inside cochlea that shares wall with organ of corti
Scala vestibuli
Chamber in cochlea that shares wall with opposite side of organ of corti
Opening in the cochlea bone that allows stapes vibrations to pass through:
Oval window
What causes stimulation of cranial nerve VIII
Cilia movement in the organ of corti
Opening responsible for absorbing displacement of the three fluid membranes
Round window
Semicircular canals location
Inside inner ear.
Anterior canal is the most superior one
Posterior canal
Horizontal canal
