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basisphenoid |
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basisphenoid /ba·si·sphe·noid/ (ba?si-sfe´noid) 1. postsphenoid. 2. an embryonic bone that becomes the back part of the body of the sphenoid.
basisphenoid one of the bones of the floor of the skull which, with the presphenoid, constitutes the sphenoid bone. basisphenoid fracture occurs in horses that rear over backwards. Characterized by unilateral facial paralysis, circling gait. Called also occipital fracture. |
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Contrast-enhanced computed tomography (CT) of the temporal bone (3-mm serial cuts) demonstrated (1) heterogenously enhancing densities with loculated collections in the left middle ear and mastoid cavities, (2) gross destruction of the mastoid portion of the left temporal bone, left occipital bone, and adjacent basisphenoid bone, and (3) destruction of the carotid canal, jugular foramen, and styloid process (figure 2). Time of fusion of the basisphenoid with the basilar part of the occipital bone in northwest Indian subjects. According to the more widely accepted theory, which was proposed by Currarino et al in 1985, the canal is formed by a vertical defect in the basisphenoid and carries the remnant of the stem of Rathke's pouch. |
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