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The ''optic foramen'' is the opening to the optic canal. 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. The left and right optic canals are 25mm apart posteriorly and 30mm apart anteriorly. They 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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「optic canal」の詳細全文を読む スポンサード リンク
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