Question

The passage sound in the ear is
a. Scala vestibuli - scala media
scala tympani – fenestra ovalis
tympanic cavity → Eustachian tube
- pharynx
b. Scala vestibuli helicotrema
scala media - fenestra rotunda
Eustachian tube - → pharynx
→
C. Scala vestibuli helicotrema
fenestra fotunda – Eustachian tube
pharynx
. d. Scala vestibuli - helicotrema
scala tympani → fenestra rotunda
tympanic cavity → Eustachian tube
- pharynx​

Answer 1

Answer : d

Explanation : The external ear recieves sound waves and directs them to the ear drum, then it vibrates in response to the sound waves and there vibrations are transmitted through the ear ossicles to the oval window ( fenestra ovalis ). These vibrations are passed to the fluid of the cochlea, where they generate waves in the lymphs. The wave in the lymphs induce a ripple in the basilar membrane. These movements of the basilar membrane bend the hair cells, pressing them against the tectorial membrane. As a result, nerve impulses are generated in the associated afferent neurons. These impulses are generated by the afferent fibres via auditory nerves to the auditory cortex of the brain, where the impulses are analysed and the sound is recognised.

d. Scala vestibuli - helicotrema - scala tympani → fenestra rotunda ( round window ) - tympanic cavity → Eustachian tube - pharynx

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