Ear
The ears are organs that provide two main functions -
hearing and balance - which depend on specialized receptors called hair cells.
Audience: The eardrum vibrates when sound waves enter
the ear canal. Ossicles, three small bones (including the yoke, the smallest
bones in the body), transmitting the vibrations to the oval window, which is a
membrane at the entrance to the inner ear.
Balance: Balance is achieved through a combination of
sensory organ of the inner ear, visual input and information received from
receptors in the body, especially around the joints. The information covered in
the cerebellum and cerebral cortex allows the body to cope with changes in
speed and direction of the head.
The ear is divided into three parts:
Outer ear: The outer ear is lined with hairs and
glands that secrete wax. This part of the ear provides protection and sound
channels.
Middle ear: Three small bones - the hammer, anvil and
stirrup - in the middle ear eardrum vibration transfer sound to the inner ear.
The middle ear is important because it is filled with many air spaces that
provide avenues for infection to move. This is also the place of the Eustachian
tube, which provides an equalization between the inner and outer surfaces of
the tympanic membrane.
The inner ear: The inner ear, also called the
labyrinth, operates the direction balances the body and contains the organ of
hearing. Bone case houses a complex system of membrane cells. The inner ear is
called the labyrinth because of its complex shape. There are two main sections
of the inner ear: the bony labyrinth and the membranous labyrinth. The cochlea,
the organ of hearing, is located within the inner ear.
Snail cochlea is composed of three liquid-filled
chambers that spiral around a core of bone that contains a central channel
called the cochlea. Inside the cochlea is the main organ of hearing, the spiral
organ of Corti. The inner hair cells in the organ of Corti detect sound and
send the information through the cochlear nerve.
Sound waves enter the outer ear, move in the middle
ear, and finally reach the inner ear and its complex network of nerves, bones,
channels and cells.
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