External auditory canal

External Auditory Canal

The External Auditory Canal or External Ear Canal is a tube running from the outer ear to the middle ear. The human ear canal extends from the pinna to the eardrum and is about 2.5 centimeters in length and 0.7 centimeters in diameter.

Anatomy

The external auditory canal forms a slight 'S' shape and is composed of two parts. The outer third of the canal is cartilaginous, while the inner two-thirds is bony. The skin of the outer, cartilaginous part contains ceruminous glands, which produce earwax.

Function

The primary function of the external auditory canal is to protect the eardrum from physical damage and to help localize sound.

Clinical significance

Infections of the external auditory canal are known as Otitis Externa. This can be caused by a variety of factors, including bacteria, fungi, and allergies. Symptoms may include pain, discharge, and hearing loss.

See also

• Ear
• Middle ear
• Inner ear
• Otitis Externa

References

External auditory canal Resources
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