Presphenoid bone

(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.

presphenoid bone

pre·sphe·noid bone

in comparative anatomy, the bone in the floor of the brain case anterior to the basisphenoid bone.

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