![]() If these conditions of the ear are not treated on time, cerumen impaction will increase the risk of developing an infection within the human ear canal. If the ear secretes an excess amount of earwax, it can press against the eardrum and occlude the external auditory canal and impairing hearing, causing some conductive hearing loss. Ear wax plays an important role in the canal of the human ear, for assisting in cleaning and lubrication and also protecting from infections like bacteria, fungi and insects. It is also called the cerumen, which is yellowish in colour and a waxy substance is secreted in the ear canals. Otitis externa is also known as the swimmer’s ear, which is a bacteria-caused inflammation of the ear canal. Granuloma, a scar usually caused by tympanostomy tubes The exposure of the bone is caused by the wearing away of the skin in the canal.Īuditory canal osteoma which is bony outgrowths of the temporal bone.Įar myiasis, an extremely rare infestation of maggots These are some of the important factors to consider while fitting the earplug in the human ear.Īs the canal of the ear is exposed to the external world, it is susceptible to various disease and disorders, some of the disorders have been mentioned below: The human ear canal forms the sigmoid and runs from behind and above the downward and the forward and on the cross-section, it is oval. The size and shape of the ear canal vary from individual to individual, the ear canal length of a human is approximately 1 inch and 0.28 inch in diameter. The epithelium encompassing layer of the bony portion of the ear canal is much thinner and more sensitive in comparison to the cartilaginous portions of the ear. The bony part forms the inner two thirds and the bony part is much shorter in children and is only a ring ( annulus tympanicus ) in the ear of the newborn babies. The cartilaginous portion of the human ear canal contains some of the small hair and also some of the specialized glands known as apocrine glands, this produce cerumen also known as ear wax. The lower wall of the ear is cartilage and continuation of the pile frame of the pinna. ![]() Its anterior and the lower wall are cartilaginous, but its superior and back wall is fibrous. The ear of the human can mainly be divided into two parts, the elastic cartilage part, which forms the outer third of the canal. It is a passageway running from the outer ear to the middle ear, the size of the adult human ear can extend from the pinna to the eardrum and the length of external auditory canal is about 2.5 cm (1 in) and 0.7 cm (0.3 in) in diameter. The brain then translates these electrical impulses as sound.The external auditory canal is also called the ear canal, external acoustic meatus, external auditory meatus (EAM). The auditory nerve sends these impulses to the brain. Once the sound waves reach the inner ear, they are converted into electrical impulses. They send the sound waves to the inner ear and into the fluid-filled hearing organ (cochlea). The vibrations are then passed to 3 tiny bones in the middle ear called the ossicles. When a sound is made outside the outer ear, the sound waves, or vibrations, travel down the external auditory canal and strike the eardrum (tympanic membrane). Semicircular canals.This contains receptors for balance. ![]() Vestibule.This contains receptors for balance. The eustachian tube is lined with mucous, just like the inside of the nose and throat.Ĭochlea.This contains the nerves for hearing. The eustachian tube helps to equalize the pressure in the middle ear. Equalized pressure is needed for the proper transfer of sound waves. The bones are called:Įustachian tube. A canal that links the middle ear with the back of the nose. Ossicles. Three small bones that are connected and transmit the sound waves to the inner ear. Middle ear (tympanic cavity), consisting of: The tympanic membrane divides the external ear from the middle ear. This is the tube that connects the outer ear to the inside or middle ear. This is the outside part of the ear.Įxternal auditory canal or tube. The ear is the organ of hearing and balance.
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