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Hearing mechanism

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The hearing mechanism involves the conversion of sound waves into electrical signals that the brain can interpret. Sound waves enter the external ear and travel through the external auditory canal, striking the tympanic membrane (eardrum) and causing it to vibrate. These vibrations are transmitted through the ossicles—malleus, incus, and stapes—located in the middle ear, which amplify the sound. The stapes then pushes against the oval window, transmitting vibrations into the fluid-filled coc...

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Summary
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PISER • Anatomy

Nerve supply of the ear

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The ear receives its nerve supply from both cranial and cervical nerves, ensuring sensation and function in its external, middle, and inner parts. The external ear, including the auricle and external auditory canal, is primarily innervated by the great auricular nerve and lesser occipital nerve (from cervical plexus), and branches from the auriculotemporal nerve (branch of mandibular nerve, CN V3), facial nerve (CN VII), and vagus nerve (CN X). The tympanic membrane has dual innervation: the ext...

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Class notes
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PISER • Anatmoy