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Different Parts of the Human Ear
Posted on Jul 28, 2015
As we all know, human ear is a vital organ of the sensory system of the body. To be precise, ear is an organ of the auditory system, which is responsible for the sense of hearing. It performs the major function of receiving sound waves and transmitting the signal to the brain. This way, we can detect and interpret different sound types. Other than hearing, our ear is important for head positioning and maintaining the body balance.

The three major parts of the human ear are the outer ear, the middle ear, and the inner ear. The working of human ear is in such a way that sound waves travel from the outer ear to the middle ear, which are then transmitted to the inner ear in the form of compressional waves. In the inner ear, the compressional waves are converted into electric impulses that are perceived by the brain. This way, we can hear and differentiate various sound types. Let us see in detail about the different parts of the human ear and their role in hearing.


The outer ear or external ear is the visible portion of the ear, which serves as a protective organ for the eardrum. It collects and guides sound waves into the middle ear. The outer ear consists of the following two parts:
  • Ear Flap (Pinna) - The sound waves enter the ear via the ear flap or pinna. 
  • Ear Canal (Meatus) - The ear canal is about 2 cm in length. It amplifies the sound waves and channelizes them to the middle ear. Sweat glands are present in this canal, which secrete earwax.


The middle ear, located between the outer ear and the inner ear, perceives sound waves from the outer ear in the form of pressure waves. The middle ear is an air-filled cavity and consists of the following parts:
  • Eardrum (Tympanic membrane) - The eardrum is a thin membrane that acts as a partition between the outer ear and the middle ear. It vibrates as soon as it receives sound waves, and transforms the sound energy into mechanical energy. 
  • Hammer (Malleus) - It is a tiny bone, located next to the eardrum. Since it lies adjacent to the eardrum, the vibrations from the eardrum cause the hammer to vibrate. 
  • Anvil (Incus) - Anvil is another tiny bone next to hammer it vibrates in response to the vibration of hammer. 
  • Stirrup (Stapes) - Similar to hammer and anvil, stirrup is a tiny bone in the middle ear. Eventually, it also vibrates and passes the compressional waves to the inner ear.


The inner ear, as the name suggests, is the innermost portion of the ear. It is filled with a water-like substance and comprises both hearing and balancing organs. The inner ear comprises the following parts:
  • Cochlea - The cochlea or the spiral tube is a rolled structure that can stretch to about 3 cm. The membrane lining of cochlea consists of numerous nerve cells. These hair-like nerve cells respond differently to various frequencies of vibrations, which ultimately lead to generation of electrical impulses. 
  • Semicircular Canals - These are fluid-filled loops, attached to the cochlea and help in maintaining the balance. 
  • Auditory Nerve - The electrical impulses, generated by the nerve cells, are then passed to the brain. 
This way, the different parts of the human ear perform specific functions that contribute to the overall functioning of the ear. Any damage or disorder in the ear parts may lead to ear problems and hearing loss (deafness).
Written by : Lazoi Team
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