Definitions
from The Century Dictionary.
- noun The posterior part of the compound sphenoid bone, including the basi-sphenoid, alisphenoids, and pterygoids, separable in infancy.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Anat.) Of or pertaining to the posterior part of the sphenoid bone.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective anatomy Of or relating to the
posterior part of thesphenoid bone .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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The presphenoid is united to the postsphenoid about the eighth month, and at birth the bone is in three pieces (Fig. 148): a central, consisting of the body and small wings, and two lateral, each comprising a great wing and pterygoid process.
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Until the seventh or eighth month of fetal life the body of the sphenoid consists of two parts, viz., one in front of the tuberculum sellæ, the presphenoid, with which the small wings are continuous; the other, comprising the sella turcica and dorsum sellæ, the postsphenoid, with which are associated the great wings, and pterygoid processes.
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Soon after, the centers for the postsphenoid part of the body appear, one on either side of the sella turcica, and become blended together about the middle of fetal life.
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Between the pre - and postsphenoid there are occasionally seen the remains of a canal, the canalis cranio-pharyngeus, through which, in early fetal life, the hypophyseal diverticulum of the buccal ectoderm is transmitted.
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There are fourteen centers in all, six for the presphenoid and eight for the postsphenoid.
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