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Encyclopedia > Squamosal

The squamosal is a bone of the head of higher vertebrates. It is the principal component of the cheek region in the skull, lying below the temporal series and otic notch and bounded anteriorly by postorbital. Posteriorly, the squamosal articulates with the posterior elements of the palatal complex, namely the quadrate and pterygoid. The squamosal is bordered anteroventrally by the jugal and ventrally by the quadratojugal. Classes and Clades Vertebrata is a subphylum of chordates, specifically, those with backbones or spinal columns. ... The quadrate is a jaw bone in all jawed vertebrates except mammals (in whom it has become a middle-ear bone, the incus). ... Pterygoid can refer to: a plate near the Vomer bone a muscle such as Lateral pterygoid muscle or Medial pterygoid muscle This is a disambiguation page — a navigational aid which lists pages that might otherwise share the same title. ... A small jaw bone found in some reptiles, amphibians and birds. ... The quadratojugal is a small jaw bone that is present in most amphibians, reptiles and birds, but has been lost in mammals. ...


References

Roemer, A. S. 1956. Osteology of the Reptiles. University of Chicago Press. 772 pp.


  Results from FactBites:
 
The Sutural System of the Cranium | Harvey Getzoff, DC, DICS (751 words)
Temporal/parietal suture (squamosal suture) -- The temporal suture overlaps the parietal, especially at the most superior point along the suture up to the posterior inferior border of the parietal, and the mastoid portion of the temporal where it is serrated.
The malar/sphenoidal suture is a squamosal suture with the sphenoid overlapping the malar.
In closing, keep in mind that facial and vault bones (parietal, frontal, and the squamosal portions of the temporal and occiput) develop from membranous tissue, are extremely pliable and continuously remodeling to meet the functional demand of the key organs of the cranial facial complex (respiratory organs, ears, eyes, teeth, and the brain).
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