zygomatic arch

zygomatic arch

noun Anatomy.
the bony arch at the outer border of the eye socket, formed by the union of the cheekbone and the zygomatic process of the temporal bone.

Origin:
1815–25

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Collins
World English Dictionary
zygomatic arch
 
n
Also called: zygoma the slender arch of bone that forms a bridge between the cheekbone and the temporal bone on each side of the skull of mammals

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

zygomatic arch n.
The arch formed by the temporal process of the zygomatic bone and the zygomatic process of the temporal bone. Also called zygoma.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

zygomatic arch

bridge of bone extending from the temporal bone at the side of the head around to the maxilla (upper jawbone) in front and including the zygomatic (cheek) bone as a major portion. The masseter muscle, important in chewing, arises from the lower edge of the arch; another major chewing muscle, the temporalis, passes through the arch. The zygomatic arch is particularly large and robust in herbivorous animals, including baboons and apes. In human evolution the zygomatic arch has tended to become more gracile (slender). For example, Australopithecus robustus, an early hominid, had a large zygomatic arch, taken by some scholars to be evidence for a herbivorous diet, while Australopithecus africanus, a later hominid, had a small, fragile-looking arch and is generally believed to have been a hunter and omnivore. In modern humans the zygomatic arch is more prominent in some populations and is larger and more robust in males

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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