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Anatomy

Hearing and Balance

QuestionAnswer
External Ear Pinna, External Auditory Canal, Tympanic Membrane,
External ear can change in Pressure and is filled with air
External also called... Pinna
Pinna Cartilage of ear, Also called Auricle
Tympanic membrane (ear drum) Is where sound waves hit, Separates the external auditory canal from the middle ear
Middle Ear Eustachian tube, Auditory Ossicles (3)
Middle ear can change in Pressure and is filled with air
Eustachion Tube (Auditory Tube) Leads to throat, equalization of pressure
Auditory Ossicles Malleus, Incus, Stapes
Malleus (Hammer) Connected to tympanic membrane
Incus (Anvil) Amplifies movement of the Malleus
Stapes (Stirrup) Connected to oval window
Stapedius is the Smallest muscle in the body
Inner Ear Fluid filled and solid
Inner consists of.... Cochlea, Vestibule, Bony Labyrinth
Cochlea Hearing
Cochlea consists of... Oval window and Round window
Oval window Membrane that connects to auditory ossicles, connects with the Stapes
Round Window Membrane that permits pressure changes, place where perilymph expands to.
Vestibule For equilibrium, connects the cochlea to the semicircular canals.
Semicirular Canals Balance
Anterior Semicircular Canals Respond to nodding of head
Posterior Semicircular Canals Respond to sideways tilting of head
Lateral Semicircular Canals Respond to horizontal rotation of head
Ampulla Contains sensory receptors
Bony Labyrinth Bone surrounding Cochlea and Vesibule
External Auditory Canal Sound waves travel through it
Saccule & Utricle are involved with Foward and backward movement
Organ of Corti Contains fluid; endolymph
Stereocilia Branch to form cochlear nerve, hair cells in endolymph
Created by: tinks83
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