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sphenoid

Syllabification: sphe·noid
Pronunciation: /ˈsfēnoid
 
/
Anatomy

Definition of sphenoid in English:

noun

(also sphenoid bone)
A compound bone that forms the base of the cranium, behind the eye and below the front part of the brain. It has two pairs of broad lateral “wings” and a number of other projections, and contains two air-filled sinuses.
Example sentences
  • A large groove (sinus of Breschet) may occur on the intracranial face, parallel to the coronal suture and extending from the bregma to the lesser wing of the sphenoid.
  • Another such feature are the deep internasal cavities on either side of the sphenoid.
  • Metastasis to the brain can occur by way of Batson's plexus or by direct extension from adjacent structures such as the sphenoid bone or sinuses.

adjective

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Relating to the sphenoid bone.
Example sentences
  • The maxillary sinus is most commonly involved; however, most patients with radiologic maxillary sinusitis have abnormalities of the ethmoid and sphenoid sinuses.
  • Magnetic resonance imaging showed a mass bilaterally in the nasopharynx and the sphenoid sinuses.
  • Its accuracy, however, is questionable in suspected ethmoid, frontal, or sphenoid involvement.

Origin

mid 18th century: from modern Latin sphenoides, from Greek sphēnoeidēs, from sphēn 'wedge'.

Derivatives

sphenoidal

1
Pronunciation: /sfēˈnoidl/
adjective
Example sentences
  • Branches of the nasal nerve have been described passing to the frontal, ethmoidal, and sphenoidal sinuses.
  • The middle meningeal gives rise, in about 50% of cases, to an accessory meningeal artery, which also enters the skull via the foramen ovale, or the emissary sphenoidal foramen.
  • The ophthalmic artery may be associated with the development of a branch of the lacrimal artery that passes through the sphenoidal fissure to anastomose with the middle meningeal artery.

Definition of sphenoid in:

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