part of part of conduit for cranial nerve II ophthalmic artery sphenoid bone orbitosphenoid optic foramen https://upload.wikimedia.org/wikipedia/commons/8/8e/Orbita_mensch.jpg optic foramen optic nerve (II) foramen Wikipedia:Optic_canal An opening in the skull through which cranial nerve II passes.[MP]. EHDAA:10646 optic foramen UBERON:0005745 VHOG:0001408 In teleost fishes the opening is wider that in mammals. Due to the longer and deeper shape in mammals, this is usually called the optic canal; sometimes the term optic foramen may be used for the opening of the canal, but here we use this term to denote the entire space together with surrounding bone surface. canalis opticus ZFA:0005428 AAO:0000342 optic nerve foramen EMAPA:18716 TAO:0002025 FMA:54774 SCTID:361732009 EHDAA2:0001312 optic canal foramen opticum ossis sphenoidalis foramen of skull lateral structure