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Definition of Sphenoid bone

Sphenoid bone: A prominent, irregular, wedge-shaped bone at the base of the skull. The sphenoid bone has been called the 'keystone' of the cranial floor because it is in contact with all of the other cranial bones.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=10465
Last Editorial Review: 3/19/2012

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