Zygomatic arch

Zygomatic arch

Infobox Anatomy
Name = PAGENAME
Latin = arcus zygomaticus
GraySubject = 46
GrayPage = 183


Caption = Side view of the skull.


Caption2 = Articulation of the mandible. Lateral aspect.
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DorlandsPre = a_58
DorlandsSuf = 12150836
The zygomatic arch is formed by the zygomatic process of temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomatic bone (the side of the cheekbone), the two being united by an oblique suture; the tendon of the Temporalis passes medial to the arch to gain insertion into the coronoid process of the mandible.

The zygomatic process of the temporal arises by two roots:
* an "anterior", directed inward in front of the mandibular fossa, where it expands to form the articular tubercle.
* a "posterior", which runs backward above the external acoustic meatus and is continuous with the supramastoid crest.

The upper border of the arch gives attachment to the temporal fascia; the lower border and medial surface give origin to the Masseter.

The zygomatic arch is significant in evolutionary biology, as it is part of the structures derived from the ancestral single temporal fenestra of the synapsid ancestor of mammals.


=Additional

External links

*
* (NormanAnatomyFig|latskullitems)
*
* [http://www.unc.edu/~jbl/PanAnatomy/skull%20images/zygomatic-arch-s.html Diagram at unc.edu]


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Look at other dictionaries:

  • Zygomatic arch — Zygomatic yg o*mat ic (?; 277), a. [Cf. F. zygomatique.] (Anat.) Of, pertaining to, or in the region of, the zygoma. [1913 Webster] {Zygomatic arch}, the arch of bone beneath the orbit, formed in most mammals by the union of the malar, or jugal …   The Collaborative International Dictionary of English

  • zygomatic arch — n. Anat. a bony arch on either side of the face just below the eye in many vertebrates, consisting of a zygomatic bone having a process that fuses with the zygomatic process of the temporal bone …   English World dictionary

  • zygomatic arch — Anat. 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. See diag. under skull. [1815 25] * * * ▪ anatomy       bridge of bone extending from the temporal bone …   Universalium

  • Zygomatic arch — The part of the temporal bone of the skull that forms the prominence of the cheek. The zygomatic arch is also known as the zygomatic bone, the zygoma, the malar bone, the cheek bone and the yoke bone. The word zygomatic comes from the Greek zygon …   Medical dictionary

  • zygomatic arch — noun the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone • Syn: ↑zygoma, ↑arcus zygomaticus • Derivationally related forms: ↑zygomatic (for: ↑zygoma) • Hy …   Useful english dictionary

  • zygomatic arch — noun An arch formed by the zygomatic process of temporal bone and the temporal process of the zygomatic bone …   Wiktionary

  • zygomatic arch — zy′gomat′ic arch′ n. anat. 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 • Etymology: 1815–25 …   From formal English to slang

  • zygomatic arch — zygoma the horizontal arch of bone on either side of the face, just below the eyes, formed by connected processes of the zygomatic and temporal bones. See: skull …   The new mediacal dictionary

  • zygomatic arch — noun Date: 1825 the arch of bone that extends along the front or side of the skull beneath the orbit …   New Collegiate Dictionary

  • zygomatic arch — /zaɪgəˌmætɪk ˈatʃ/ (say zuyguh.matik ahch) noun the narrow arch of bone between the malar bone and the temporal bone of mammals …  

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