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Basic Fact of EAR

Basic Fact of EAR. Ears are used to detect SOUND in environment. Ears help to detect movement & position. Ear is divided into Outer Ear, Middle Ear & Inner Ear. Structure of EAR. Outer Ear: EAR PINNA, EAR CANAL & EAR DRUM. Middle Ear: EAR BONES Inner Ear: EUSTACHIAN TUBE & ADENOIDS.

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Basic Fact of EAR

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  1. Basic Fact of EAR • Ears are used to detect SOUND in environment. • Ears help to detect movement & position. • Ear is divided into Outer Ear, Middle Ear & Inner Ear.

  2. Structure of EAR • Outer Ear: EAR PINNA, EAR CANAL & EAR DRUM. • Middle Ear: EAR BONES • Inner Ear: EUSTACHIAN TUBE & ADENOIDS.

  3. Outer Ear • It is the part which is visible and is made of folds of skin and cartilage. • It leads into the ear canal, which is about one inch long in adults and is closed at the inner end by the eardrum. • The eardrum is a thin, fibrous, circular membrane covered with a thin layer of skin. • It vibrates in response to changes in the air pressure that constitute sound. • The eardrum separates the outer ear from the middle ear.

  4. Middle Ear • It is a small cavity which conducts sound to the inner ear by means of three tiny, linked, movable bones called "ossicles." • These are the smallest bones in the human body and are named for their shape. • The hammer (malleus) joins the inside of the eardrum. • The anvil (incus) has a broad joint with the hammer and a very delicate joint to the stirrup (stapes). • The base of the stirrup fills the oval window which leads to the inner ear.

  5. Inner Ear • The inner ear is a very delicate series of structures deep within the bones of the skull. • It consists of a maze of winding passages, called the "labyrinth". • The front (see cochlea) is a tube resembling a snail's shell and is concerned with hearing. • The rear part is concerned with balance.

  6. Detection of SOUND • Sound waves (air vibrations) are collected by the OUTER EAR. • Sound waves vibrate the EAR DRUM. • Vibrations are amplified by the EAR BONES. • Vibrations change the pressure of the FLUID of the INNER EAR. • Vibrations are transmitted to signals to the brain via nerve impulses.

  7. Intensity Cues in Stereo • When the volume of two speakers are equal, we will hear the sound as come from the centre.

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