The diagram alongside represents the structure found in the inner ear. Study the same and then answer the questions that follow:
Figure

(i) Name the parts labelled A, B, C and D.
(ii) Name the part of the ear responsible for transmitting impulses to the brain.
(iii) Name the part labelled above which is responsible for:
1. Static equilibrium
2. Dynamic equilibrium
3. Hearing.
(iv) Name the audio receptor cells which pick up vibrations.
(v) Name the fluid present in the inner ear.

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Solution

(i)

(ii) The cochlea converts the sound pressure patterns from the outer ear into electrochemical impulses, which are passed on to the brain via the auditory nerve.

(iii) 1. B - Utriculus and C - Sacculus function in a static equilibrium.
2. Three semi-circular canals, each at a right angle to one another, function in a dynamic equilibrium.
3. The cochlea is the main hearing organ of the ear.

(iv) The organ of Corti consists of audio receptor cells that pick up vibrations.

(v) The fluid in the inner ear is called the perilymph.

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