The figure below is the sectional view of a part of the skull showing a sense organ :
(i) Name the sense organ.
(ii) What are the parts labelled "m", "i" and "s" ? What do these three parts constitute collectively?
(iii) What do you call the part shown in the form of a spiral? What is its function?
(iv) Name the part labelled "tm"? What is its function?

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Solution

(i) Ear
(ii) m – malleus, i – incus and s – stapes respectively. These are collectively called as ear ossicles.
(iii) Cochlea. The vibrating movements in the hair of the sense cells of cochlea transmit the impulse for hearing to the brain via auditory nerve.
(iv) Tympanic membrane. It vibrates and then sets the ear ossicles into vibration in the process of hearing

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