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The ear canal (external acoustic meatus, external auditory meatus, EAM) is a pathway running from the outer ear to the middle ear. The adult human ear canal extends from the auricle to the eardrum and is about 2.5 centimetres (1 in) in length and 0.7 centimetres (0.3 in) in diameter.
Stricture as a term is usually used when narrowing is caused by contraction of smooth muscle (e.g. achalasia, prinzmetal angina); stenosis is usually used when narrowing is caused by lesion that reduces the space of lumen (e.g. atherosclerosis). [4] The term coarctation is another synonym, [5] but is commonly used only in the context of aortic ...
denoting something as narrow in shape or pertaining to narrowness Greek στενός (stenós), narrow, short stenography-stenosis: abnormal narrowing of a blood vessel or other tubular organ or structure Greek στενός (stenós), narrow, short; + -σῐς (-sis), added to verb stems to form abstract nouns or nouns of action, result or process
The ear is designed to be self-cleaning, but some people are more prone to earwax buildup due to their ear canal shape. For example, very curvy ear canals, narrow ear canals, or surgical ears are ...
The human ear is divided into three sections. Each section has its own specialized function. The outer ear acts like a funnel and takes in the sound. The middle ear holds the tympanic membrane, or ear drum and several little bones that are moved by the sound waves that have entered the ear via the canal. These movements are very small, like ...
In humans and other tetrapods, both the middle ear and the ear canal are normally filled with air. Unlike the air of the ear canal, however, the air of the middle ear is not in direct contact with the atmosphere outside the body; thus, a pressure difference can develop between the atmospheric pressure of the ear canal and the middle ear.
The iter chordæ posterius (apertura tympanica canaliculi chordæ) is situated in the angle of junction between the mastoid and membranous wall of tympanic cavity immediately behind the tympanic membrane and on a level with the upper end of the manubrium of the malleus; it leads into a minute canal, which descends in front of the canal for the ...
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