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Anatomy of the Ear

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Semicircular Canals

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Part of the vestibular system, important for balance and spatial orientation.

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Auditory Nerve (Cochlear Nerve)

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Carries auditory sensory information from the cochlea of the inner ear directly to the brain.

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Tympanic Membrane (Eardrum)

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Vibrates in response to sound waves; convert acoustic energy into mechanical energy.

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Malleus (Hammer)

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Connects with the eardrum to transmit sounds to the incus.

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Organ of Corti

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Contains hair cells that convert vibratory motion into electrical signals for the auditory nerve.

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Cochlear Duct (Scala Media)

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Part of the cochlea that contains the endolymph which the Organ of Corti sits in.

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Perilymph

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Fluid within the cochlea in two of its three compartments (scala vestibuli and scala tympani) that carries sound vibrations to the cochlear duct.

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Round Window

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Allows for the displacement of cochlear fluid caused by the movement of the oval window.

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Pinna (Auricle)

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Funnel sounds into the ear canal and assists in sound localization.

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Vestibule

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The central part of the bony labyrinth, involved in the sense of balance.

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Eustachian Tube

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Equalizes air pressure in the middle ear with the external atmosphere.

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Oval Window

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Transfers mechanical vibrations from the stapes to the fluid in the cochlea.

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Incus (Anvil)

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Transfers vibrations from the malleus to the stapes.

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Cochlea

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Transduces mechanical sound vibrations into nerve impulses which are sent to the brain.

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Helicotrema

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A passage at the apex of the cochlea that connects the scala tympani and scala vestibuli allowing fluid to move between them.

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Endolymph

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Fluid within the cochlea's scala media that plays a key role in the process of auditory transduction.

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External Auditory Canal (Ear Canal)

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Transmits sound from the pinna to the eardrum; contributes to the resonance of sound.

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Tectorial Membrane

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Involved in the auditory transduction process by interacting with the hair cells of the Organ of Corti.

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Stapes (Stirrup)

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Conveys vibrations from the incus to the oval window of the cochlea.

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Basilar Membrane

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It supports the Organ of Corti and vibrates in response to sound, allowing hair cells to transduce mechanical signals.

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