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The squamosal is a skull bone found in most reptiles, amphibians, and birds. In fishes, it is also called the pterotic bone.[1]
In most tetrapods, the squamosal and quadratojugal bones form the cheek series of the skull.[2] The bone forms an ancestral component of the dermal roof and is typically thin compared to other skull bones.[3]
The squamosal bone lies ventral to the temporal series and otic notch, and is bordered anteriorly by the postorbital. Posteriorly, the squamosal articulates with the quadrate and pterygoid bones. The squamosal is bordered anteroventrally by the jugal and ventrally by the quadratojugal.[4]
- ^ Allis, Edward Phelps (1919). "On the homologies of the squamosal bone of fishes". The Anatomical Record. 17 (2): 72–87. doi:10.1002/ar.1090170202. S2CID 85000711.
- ^ Romer, Alfred Sherwood, 1894-1973. (1978). The vertebrate body : shorter version. Parsons, Thomas S. (Thomas Sturges), 1930- (5th ed.). Philadelphia: Saunders. ISBN 0-7216-7682-0. OCLC 3345587.
{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link) - ^ Homberger, Dominique G. (2004). Vertebrate dissection. Walker, Warren F. (Warren Franklin), Walker, Warren F. (Warren Franklin). (9th ed.). Belmont, CA: Thomson Brooks/Cole. ISBN 0-03-022522-1. OCLC 53074665.
- ^ Roemer, A. S. (1956). Osteology of the Reptiles. University of Chicago Press. p. 772.