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) The above-given figure is a sectional view of an ear.
(ii) The parts labeled are:
m shows malleus
i shows incus
These three collections are known as ear ossicles.
(iii) The part shown in form of a spiral is cochlea. The cochlea is the innermost part of the inner ear, cochlea translates sound into a nerve impulse that is sent to the brain via the auditory nerve.
(iv) The labeled part 'tm' is a tympanic membrane also called as the eardrum. It is thin layer tissue which receives sound vibrations from the outer air and transmits them to the ear ossicles in the process of hearing.

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