The orbital apex is a cone-shaped structure formed by the oculomotor muscles and centered by the optic nerve. The orbital cone constitutes the rostral part of the interperiosteo-dural space. The extremity of this cone opens into the cavernous sinus through the superior orbital fissure. The cranial nerves converge toward this fissure and innervate the extrinsic and intrinsic muscles of the globe and its annexes. The optic nerve goes through the optic canal. Its dural sheath becomes part of the anular tendon onto which the oculomotor muscles are inserted. The ophthalmic artery originates under the optic nerve then penetrates into the orbit by going through the optic nerve' s dural sheath. The ophthalmic veins empty into the cavernous sinus. They lie outside the anular tendon. The trochlear, frontal and lacrymal nerves are located outside the cone.
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