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Optic canal

Feature of the human skull

Summary

Feature of the human skull

Field	Value
Name	Optic foramen
Latin	canalis opticus, foramen opticum ossis sphenoidalis
Image	Orbita mensch.jpg
Caption	1: Foramen ethmoidale
2: Canalis opticus
3: Fissura orbitalis superior
4: Fossa sacci lacrimalis
5: Sulcus infraorbitalis
6: Fissura orbitalis inferior
7: Foramen infraorbitale
Image2	Gray193.png
Caption2	Base of the skull. Upper surface. (On the left, "Optic foramen" is the 12th label from the top.

2: Canalis opticus 3: Fissura orbitalis superior 4: Fossa sacci lacrimalis 5: Sulcus infraorbitalis 6: Fissura orbitalis inferior 7: Foramen infraorbitale The optic foramen is the opening to the optic canal. The canal is located in the sphenoid bone; it is bounded medially by the body of the sphenoid and laterally by the lesser wing of the sphenoid.

The superior surface of the sphenoid bone is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the chiasmatic groove (optic groove), above and behind which lies the optic chiasma; the groove ends on either side in the optic foramen, which transmits the optic nerve and ophthalmic artery (with accompanying sympathetic nerve fibres) into the orbital cavity. Compared to the optic nerve, the ophthalmic artery is located inferolaterally within the canal.

The left and right optic canals are 25mm apart posteriorly and 30mm apart anteriorly. The canals themselves are funnel-shaped (narrowest anteriorly).

Additional images

File:Orbital_bones.png|The seven bones which articulate to form the orbit. File:Gray145.png|Sphenoid bone. Upper surface. File:Gray192.png|Medial wall of left orbit. File:Gray787.png|Dissection showing origins of right ocular muscles, and nerves entering by the superior orbital fissure. File:Optic canal.jpg|Optic canal

References

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

foramina-of-the-skull

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