It lies posterior and superior to the superior concha into which thesphenoidalsinus opens.
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The incidence of bilateral and unilateralsphenoidalemissary foramen was 22.85% (8 out of 35 skulls) and 20% (7 out of 35 skulls) respectively.
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This involves penetrating three separate sinus cavities: the ethmoid sinus, thesphenoidalsinus, and the maxillary sinus.
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This border is continuous above with thesphenoidalprocess; below it expands into the pyramidal process.
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Thus, for the usually symmetricsphenoidalemissary foramina, asymmetry is more likely the result of a pathologic process than a normal variant.
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The posterior surface presents large irregular cellular cavities, which are closed in by articulation with thesphenoidalconcha and orbital process of palatine bone.
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Another specific wormian bone, the pterion ossicle, sometimes exists between thesphenoidalangle of the parietal bone and the great wing of the sphenoid bone.
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To thesphenoidalspine are attached the sphenomandibular ligament and the tensor veli palatini muscle.
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In a study conducted under 100 skulls, thesphenoidalemissary foramen was only present in 17% of the cases, and it was always single.
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The posterior border articulates by its upper half with thesphenoidalcrest, by its lower with the vomer.
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Thesphenoidaland posterior fontanelles close during the first few months of life.
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This mineral is orthorhombic andsphenoidal, exhibiting symmetry on 222.
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The superior border supports the orbital process in front and thesphenoidalprocess behind.
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Other than the anterior and posterior fontanelles, the mastoid fontanelle and thesphenoidalfontanelle are also significant.
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Out of the 70 sides observed (35 skulls total), thesphenoidalemissary foramen was present in 32.85% of the cases (20.0% right side, 12.85% left side).
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