Intertragic notch
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The intertragic notch is an anatomical feature of the
ear An ear is the organ that enables hearing and, in mammals, body balance using the vestibular system. In mammals, the ear is usually described as having three parts—the outer ear, the middle ear and the inner ear. The outer ear consists of ...
s of mammals. In humans, it is the space that separates the tragus from the
antitragus The antitragus is a feature of mammalian ear anatomy. In humans, it is a small tubercle on the visible part of the ear, the pinna. The antitragus is located just above the earlobe and points anteriorly. It is separated from the tragus by the in ...
in the
outer ear The outer ear, external ear, or auris externa is the external part of the ear, which consists of the auricle (also pinna) and the ear canal. It gathers sound energy and focuses it on the eardrum (tympanic membrane). Structure Auricle The ...
. It is the point specified (although not by that name) in the
U.S. Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
’s regulation governing the length of
sideburns Sideburns, sideboards, or side whiskers are facial hair grown on the sides of the face, extending from the hairline to run parallel to or beyond the ears. The term ''sideburns'' is a 19th-century corruption of the original ''burnsides'', named ...
in male soldiers.Army Regulation 670–1
(3 February 2005),”Wear and Appearance of Army Uniforms and Insignia”, 1-8, a, (2), b. “Sideburns will not extend below the lowest part of the exterior ear opening.”


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* * () (#6) Ear {{anatomy-stub