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Cochlea

Which of the ...

Question

Which of the following correctly describes the location of the organ of Corti?

A

Between the tympanic membrane and the oval window in the inner ear

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B

In the utricle and saccule within the vestibule

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C

Between the tectorial membrane and the basilar membrane in the cochlear canal

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D

Between the outer and inner ear within the semicircular canals

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Solution

The correct option is C Between the tectorial membrane and the basilar membrane in the cochlear canal
The organ of balance is found inside the inner ear. It is made up of three semicircular canals and two otolith organs. The organ of Corti is found between the tectorial membrane and the basilar membrane in the cochlear canal. Each semicircular canals end in a space that has a small hair cell in it.

So, the correct option is 'Between the tectorial membrane and the basilar membrane in the cochlear canal'.

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Q. Following is a list of the events (in a random order) that lead to the formation of an auditory impulse.
(i) Vibration is transferred from the malleus to the incus to the stapes.
(ii) Basilar membrane moves up and down.
(iii) Nerve impulse is transmitted in cochlear nerve to auditory cortex of brain for impulse analysis and recognitions.
(iv) Sound waves pass through ear canal.
(v) Stereocilia of hair cells of organ of Corti rub against tectorial membrane.
(vi) Sound waves cause ear drum to vibrate.
(vii) Nerve impulse is generated.
(viii) Vibrations move from fluid of vestibular canal to the fluid of tympanic canal.
(viii) Vibrations move from fluid of vestibular canal to the fluid of tympanic canal.
(ix) Membrane at oval window vibrates.
Which of the following options represents these events in a correct order?

Q. Assertion :Hair cells on the basilar membrane (the organ of Corti) are responsible for hearing. Reason: Pressure waves, which begin at the oval window, cause the basilar membrane to vibrate, so that the cilia of the hair cells touch the tectorial membrane. This causes the hair cells to initiate nerve impulses, which are carried by the auditory nerve to the brain.

Q. The vibrations of the tympanic membrane are amplified approximately ............... times in the oval window.

Q. Match column I with column II and choose the correct option.

	Column I		Column II
(a)	Cochlea	(i)	Ends at the oval window
(b)	Scala vestibuli	(ii)	Coiled part of inner ear
(c)	Organ of Corti	(iii)	Equalizes the pressure on either sides of the ear drum
(d)	Eustachian tube	(iv)	Located on the basilar membrane

Q. Identify the parts labelled as A, B, C and D in the given figure and match the correct names from the list (i - viii) given below.
(i) Reissner's membrane
(ii) Basilar membrane
(iii) Tectorial membrane
(iv) Organ of Corti
(v) Hair cells
(vi) Ototlith organ
(vii) Scala media
(viii) Scala vestibuli

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