Definitions
from The Century Dictionary.
- Situated in advance of the basisphenoid; forming an anterior median part of a compound sphenoid bone; pertaining to the presphenoid.
- noun In anatomy, a bone of the skull of vertebrates, situated before the basisphenoid, in the mid-line of the base of the skull, commonly blended with the basisphenoid and other sphenoidal elements.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Anat.) Situated in front of the sphenoid bone; of or pertaining to the anterior part of the sphenoid bone (i. e., the presphenoid bone).
- adjective (Anat.) the anterior part of the body of the sphenoid bone in front of the basisphenoid. It is usually a separate bone in the young or fetus, but becomes a part of the sphenoid in the adult.
- noun (Anat.) The presphenoid bone.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective anatomy Situated in front of the
sphenoid bone - noun anatomy The
anterior part of thesphenoid bone (a separate bone before being fused)
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Did you not some time ago tell me that you considered the Y-shaped bone (so-called presphenoid) in the Pike to be the true basisphenoid?
The Life and Letters of Thomas Henry Huxley Huxley, Leonard 1900
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(so-called presphenoid) in the Pike to be the true basisphenoid?
Life and Letters of Thomas Henry Huxley — Volume 1 Thomas Henry Huxley 1860
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As an example of serial homology we might take the centra of the vertebræ -- the vomer, the presphenoid, the basisphenoid, the basioccipital and the series of centra in the spinal column.
Form and Function A Contribution to the History of Animal Morphology
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The presphenoid develops in isolation between the lateral trabeculæ, just behind the point where they fuse.
Form and Function A Contribution to the History of Animal Morphology
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Vertebrates consists, according to Müller, of three vertebræ, whose centra are the basioccipital, the basisphenoid and the presphenoid.
Form and Function A Contribution to the History of Animal Morphology
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The presphenoid, being long and pointed, is very unlike a vertebral body.
Form and Function A Contribution to the History of Animal Morphology
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The side parts of the basisphenoid and presphenoid (forming the alisphenoids and the orbitosphenoids respectively) develop in cartilage separately from the cranial basis, not like the exoccipitals in continuity with it.
Form and Function A Contribution to the History of Animal Morphology
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The presphenoid might also be considered as a vertebral body, but it develops independently of the basilar plate and trabeculæ.
Form and Function A Contribution to the History of Animal Morphology
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The hinder parts of the trabeculæ become enclosed by two processes of the basisphenoid; their front parts remain in a vestigial and cartilaginous state alongside the presphenoid.
Form and Function A Contribution to the History of Animal Morphology
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About the ninth week of fetal life an ossific center appears for each of the small wings (orbitosphenoids) just lateral to the optic foramen; shortly afterward two nuclei appear in the presphenoid part of the body.
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