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a.1.(Anat.) Situated in front of the sphenoid bone; of or pertaining to the anterior part of the sphenoid bone (i. e., the presphenoid bone).
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.
n.1.(Anat.) The presphenoid bone.
References in periodicals archive ?
[6] The post-sphenoid and presphenoid centers appear at 14 weeks and 17 weeks respectively.
However, according to Levine & Clemente (2005) its development differs, as it does not appear as an outpouching from the lateral nasal wall, but rather a constriction of the developing presphenoid recess, followed by secondary pneumatization postnatally.
This remnant extends through the sphenoidal synchondrosis, between the presphenoid and postsphenoid.