Write a note on Ear.

 Ear

Hearing is important as vision. Our ear helps us in hearing and also to maintain the balance or equilibrium of our body.

Ear

 Ear has three parts.

• External Ear
• Middle Ear
• Inner Ear

External Ear:

                           External ear consists of pinna, auditory canal and ear drum (tympanum). 

Pinna is the broad external part, made of cartilage and covered with skin. It helps to direct sound waves into auditory canal.

There are special glands in the walls of auditory canal, which produce wax. The wax and the hairs in auditory canal protect ear from small insects, gems and dust. 

In addition to this, they help to maintain the temperature and dampness of auditory canal. Auditory canal ends in ear drum. This thin membrane separates external ear from middle ear.

Middle Ear:

                        Middle ear is a chamber after external ear. Three small bones, called middle ear ossicles, are present in a chain in middle ear. Those movable bones includes malleus, incus and stapes. 

Malleus is attached with ear drum, them comes out incus and finally stapes that is connected with a membrane called oval window. Oval window separates middle ear from inner ear. Middle ear also communicates with nasal cavity through Eustachian tube. This tubes regulates the air pressure on both sides of ear drum.

Inner Ear:

                     Inner ear consists of three parts 

• Vestibule
• Semicircular canals
• Cochlea

Vestibule is present in the center of inner ear.

Three canals called semicircular canals are posterior to the vestibule.

The  cochlea is made of three ducts and wraps itself into a coiled tube. Sound receptor cells are present within the middle duct of cochlea.

Previous work