Final answer:
The optic nerve and blood vessels enter the eye through the optic disc, which is located at the posterior apex of the orbit. The optic nerve passes through the optic canal, while the blood vessels pass through the superior orbital fissure.
Step-by-step explanation:
The optic nerve and blood vessels enter the eye through the optic disc, which is a spot on the retina at the back of the eye. The optic nerve carries nerve impulses from the retina to the brain, while the blood vessels supply nutrients and oxygen to the inner retina. This area is located at the posterior apex of the orbit, with the optic nerve passing through the optic canal and the blood vessels passing through the superior orbital fissure.