Q. Arrange the following events in a correct order that lead to the formation of an auditory impulse in human ears from the codes given below I. Vibration is transferred from the malleus to the incus and then to stapes II. Basiliar membrane moves up and down III. Nerve impulse is transmitted by cochlear nerve to auditory cortex of brain for impulse analysis and recognition IV. Sound waves pass through ear canal V. Stereocilia of hair cells of organ of Corti rub against tectorial membrane VI. Sound waves causes ear drum to vibrate VII. Nerve impulse is generated VIII. Vibrations move from fluid of vestibular canal to the fluid tymapanic canal IX. Membrane at oval window vibrates Codes

A) IV, VI, I, IX, VIII, II, V, VII, III
B) I, II, III, IV, V, VI, VII, VIII, IX
C) IX, VIII, VII, VI, V, IV, III, II, I
D) IV, VI, I, VIII, IX, II, V, VII, III
Explanation

Mechanism of Hearing Sound waves $\rightarrow$ Tympanic membrane $\rightarrow$ Vibrations $\rightarrow$ Ear ossicles (malleus, incus and stapes). The vibrations are passed through the oval window on to the fluid of counter where they generate waves which travel to Scala vestibuli $\rightarrow$ Reissner’s membrane $\rightarrow$ Scala media $\rightarrow$ Tectorial membrane is vibrated $\rightarrow$ Tectorial membrane touches the hair cells organ of corti. As a result, nerve impulses are generated in the afferent neurons. These impulses are carried by the afferent nerve fibres through the auditory nerve to the auditory nerve to the cortex in the temporal lobe of the cerebral hemisphere of the brain where the impulses are analysed and the sound is recognised. Ear also performs the function of balancing (equilibrium)

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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