The lesser wing is connected to the body by two roots, the upper thin and flat, the lower thick and triangular; between the two roots is the optic foramen, for the transmission of the optic nerve and ophthalmic artery.
2.
This surface is bounded behind by a ridge, which forms the anterior border of a narrow, transverse groove, the prechiasmatic 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 into the orbital cavity.
3.
However, the optic foramen ( what they call the optic nerve canal ) is positioned closer to the bottom of the orbit than in a normal human skull, not actually at the bottom as stated in the quote above ( Dr . Mausolf as cited in Pye, 2007, pp . 100-105 ).
4.
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.
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