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Delhi

Ear

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Published in: Biology
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This note is related to ear. It have a well labelled diagram and mechanism of hearing. Useful for class 9 th and 10th.

Varsha C / Bangalore

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  1. Ear Ear consist Of 3 parts 1. External year 2. Middle ear 3. Inner ear External ear 1. It consist of pinnae and auditory canal. 2. Pinna have certain grooves present on it whish helps to collect the sound waves. 3. These sound ways travel through to auditory canal. 4. This canal have a lining of ciliated columnar epithelium. 5. The cilia present traps dust and microbes and prevent their entry into the ear. 6. There are certain glands present which secretes waxy oil called as cerumen. 7. This wax also protects the ear from dust and microbes. Middle ear. 1. It consist of tympanic membrane and bony ossicles called as malleus, incus and stapes. Malleus looks like a hammer, incus looks like anvil and stapes looks like a stirrup 2. They sound waves that entered the auditory canal strikes on the tympanic membrane which causes the membrane to create vibrations. 3. These vibrations are then concentrated to the smallest bones of the body called as ossicles. 4. These ossicles amplifies the vibrations and send the vibrations to the cochlea. Inner ear. 1. It consist of semicircular canals, vestibula and cochlea. 2. Semicircular canal and vestibula helps our body to maintain its balance. 3. They are filled with a fluid called endolymph. 4. Cochlea is the part involved in hearing. It is also filled with fluid.
  2. 5. Vibrations received from the ossicles travel through the fluid in the cochlea and reaches the auditory nerve. 6. There these vibrations causes the generatipon of nerve impulses which are then carried towards the brain via auditory nerve. Sern.jcimda.g finn.ae canal I Midd& €R+exna.L
  3. Sound wave produced Collected by the pinnae Travels through the auditory canal Strikes the tympanic membrane Vibrations are generated Vibrations gets amplified by the ossicles Amplified vibrations travel through the cochlea Reaches the auditory nerve Nerve impulse generated Carried to the brain via auditory nerve.

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