The sphenoid bone is an unpaired pneumatic unpredictable bone, arranged at the base of the skull, and wedged between the frontal and ethmoid bones in front, basi-occiput and petrous piece of transient bones behind, and squamous part of the worldly bone on each side.
The sphenoid comprises of a focal body and combines of more prominent and lesser wings and pterygoid forms. It takes after a bat with wings outstretched and remains on pterygoid forms which speak to its legs.
It is cuboidal fit as a fiddle and contains a couple of sphenoidal air sinuses, isolated by a middle segment which is typically redirected to the other side. The body presents six surfaces – prevalent, substandard, front, back and a couple of sidelong surfaces.
(Related: musculocutaneous nerve)
Prevalent (cerebral) surface presents from before in reverse the accompanying highlights:
- Ethmoidal spine—It shapes a triangular projection between the two lesser wings and expresses with the back edge of the cribriform plate of ethmoid bone.
- Jugum sphenoidale is a smoothed plate of bone whereupon lay on each side gyrus rectus of the frontal flap and olfactory tract.
- Sulcus chiasmaticus is a shallow transverse depression which leads on each side to the optic trench. Foremost piece of the optic chiasma lies somewhat over the sulcus.
- Tuberculum sellae is the back furthest reaches of sulcus chiasmaticus, and gives front connection to the diaphragmasellae which frames the dural top of hypophyseal fossa. On each side the tuberculum presents a little projection, the center clinoid process, which is associated with the foremost clinoid process by the carotido-clinoid tendon. The carotido-clinoid foramen in this manner framed between the tendon and the collection of sphenoid transmits upturned course of inner carotid supply route. Incidentally the carotido-clinoid tendon is changed over into a bone.
- Hypophyseal fossa is a profound gloom which contains the hypophysis cerebri or pituitary organ. The floor of the fossa is identified with the sphenoidal sinuses.
- A little middle cranio-pharyngeal trench is at times seen in the floor of the fossa and is accepted to speak to a leftover of Rathke’s pocket from which the foremost projection of pituitary organ is created. Arey (1950), in any case, opines that the waterway shows up optionally for the section of veins.
- Dorsum sellae is a square-like plate of bone which extends upward and presents a cone-shaped projection, the back clinoid process, on each side; the last offers connection to the foremost end of the joined edge of tentorium cerebelli and is associated with the front clinoid procedure of the lesser wing by the interclinoid tendon. The upper edge of dorsum sellae gives back connection to the diaphrgmasellae.