AskDefine | Define cheekbone

Dictionary Definition

cheekbone n : the arch of bone beneath the eye that forms the prominence of the cheek [syn: zygomatic bone, mala, malar bone, jugal bone, os zygomaticum]

User Contributed Dictionary

English

Etymology

From cheek + bone.

Noun

  1. The small prominent bone of the cheek.

Translations

bone

Extensive Definition

The zygomatic bone came from the latin tearm zyosislymore meaning malar bone (malar bone) is a paired bone of the human skull. It articulates with the maxilla, the temporal bone, the sphenoid bone and the frontal bone. It forms part of the orbit and is commonly referred to as the cheekbone. It is situated at the upper and lateral part of the face: it forms the prominence of the cheek, part of the lateral wall and floor of the orbit, and parts of the temporal and infratemporal fossae [Fig. 1]. It presents a malar and a temporal surface; four processes, the frontosphenoidal, orbital, maxillary, and temporal; and four borders.

Surfaces

The malar surface is convex and perforated near its center by a small aperture, the zygomaticofacial foramen, for the passage of the zygomaticofacial nerve and vessels; below this foramen is a slight elevation, which gives origin to the Zygomaticus.
The temporal surface, directed posteriorly and medially, is concave, presenting medially a rough, triangular area, for articulation with the maxilla (articular surface), and laterally a smooth, concave surface, the upper part of which forms the anterior boundary of the temporal fossa, the lower a part of the infratemporal fossa. Near the center of this surface is the zygomaticotemporal foramen for the transmission of the zygomaticotemporal nerve.

Process

The zygomatic process is a protrusion from the rest of the skull, like the bumper of a car. Most of it belongs to the zygomatic bone, but there are other bones contributing to it too, namely the frontal bone, maxilla and temporal bone.

Borders

The antero-superior or orbital border is smooth, concave, and forms a considerable part of the circumference of the orbit.
The antero-inferior or maxillary border is rough, and bevelled at the expense of its inner table, to articulate with the maxilla; near the orbital margin it gives origin to the Quadratus labii superioris.
The postero-superior or temporal border, curved like an italic letter f, is continuous above with the commencement of the temporal line, and below with the upper border of the zygomatic arch; the temporal fascia is attached to it.
The postero-inferior or zygomatic border affords attachment by its rough edge to the Masseter.

Ossification

The zygomatic bone is generally described as ossifying from three centers - one for the malar and two for the orbital portion; these appear about the eighth week and fuse about the fifth month of fetal life.
Mall describes it as being ossified from one center which appears just beneath and to the lateral side of the orbit.
After birth, the bone is sometimes divided by a horizontal suture into an upper larger, and a lower smaller division.
In some quadrumana the zygomatic bone consists of two parts, an orbital and a malar.

Articulations

The zygomatic articulates with four bones: the frontal, sphenoidal, temporal, and maxilla.

Additional illustrations

Image:Orbital_bones.png|The seven bones which articulate to form the orbit. Image:Illu facial bones.jpg|Facial bones.

Beauty

High cheek bones are seen as a sign of beauty in many cultures and is a characteristic of many high fashion models.

External links

cheekbone in Arabic: عظم وجني
cheekbone in Czech: Kost lícní
cheekbone in German: Jochbein
cheekbone in Estonian: Sarnaluu
cheekbone in Spanish: Hueso cigomático
cheekbone in Esperanto: Zigomo
cheekbone in French: Os zygomatique
cheekbone in Western Frisian: Jokbonke
cheekbone in Ido: Zigomato
cheekbone in Italian: Osso zigomatico
cheekbone in Latin: Os zygomaticum
cheekbone in Latvian: Vaiga kauls
cheekbone in Lithuanian: Skruostakaulis
cheekbone in Dutch: Jukbeen
cheekbone in Japanese: 頬骨
cheekbone in Polish: Kość jarzmowa
cheekbone in Portuguese: Osso zigomático
cheekbone in Slovak: Jarmová kosť
cheekbone in Slovenian: Ličnica
cheekbone in Serbian: Јабучна кост
cheekbone in Swedish: Okben
cheekbone in Ukrainian: Вилична кістка
cheekbone in Chinese: 颧骨
Privacy Policy, About Us, Terms and Conditions, Contact Us
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2
Material from Wikipedia, Wiktionary, Dict
Valid HTML 4.01 Strict, Valid CSS Level 2.1