The superior division of the trigeminal divides into lacrimal, frontal and nasociliary branches on entering the orbit. The lacrimal innervates the lacrimal gland and sends sensory branches to the temporal rim of the orbit. The frontal branch hugs the roof of the orbit and divides into supraorbital and supratrochlear branches. The nasociliary branch passes medially between superior rectus and optic nerve, gives off ethmoidal branches, and continues as the infratrochlear nerve. The infraorbital branch of the maxillary (second) division of the trigeminal, enters the floor of the orbit through the infraorbital fissure. It gives off zygomaticotemporal and zygomaticofacial branches before passing through the infraorbital foramen to the skin of the face.
After entering the orbit with the optic nerve, the ophthalmic artery supplies the globe and ocular adnexa in the superior half of the orbit. The infraorbital branch of the maxillary artery supplies the remainder of the orbital contents.
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