Ear canal
Ear Canal
The Ear Canal (pronounced: /ɪər kəˈnæl/), also known as the external auditory meatus, is a tube running from the outer ear to the middle ear.
Etymology
The term "Ear Canal" is derived from the Latin words 'auris' meaning 'ear' and 'canalis' meaning 'channel or pipe'.
Anatomy
The ear canal is approximately 2.5 centimeters long in adults and has a slightly S-shaped curve. It is divided into two parts: the outer third, which is cartilaginous, and the inner two-thirds, which is bony and lined with thin skin. The ear canal ends at the eardrum, or tympanic membrane.
Function
The primary function of the ear canal is to protect the middle and inner ear from foreign bodies and bacteria. It also helps to direct sound waves from the outer ear to the eardrum.
Related Terms
- Outer Ear: The visible part of the ear that resides outside of the head.
- Middle Ear: The portion of the ear internal to the eardrum, and external to the oval window of the inner ear.
- Eardrum: Also known as the tympanic membrane, it is a thin, cone-shaped membrane that separates the external ear from the middle ear.
- Auditory Tube: Also known as the Eustachian tube, it is a tube that links the nasopharynx to the middle ear.
External links
- Medical encyclopedia article on Ear canal
- Wikipedia's article - Ear canal
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