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Yousun Koh

Nerves of orbit (Lateral view: eyeball in situ) (Latin)

Nerves of orbit (Lateral view: eyeball in situ) (Latin)

The r. superior nervi oculomotorii and r. inferior nervi oculomotorii (CN III) enter the orbita through the fissura orbitalis superior to supply the mm. externi bulbi oculi. The n. ophthalmicus (CN V1) passes through the sinus cavernosus and divides into three branches: the n. lacrimalis, n. frontalis and n. nasociliaris (not visible) before passing through the fissura orbitalis superior to enter the orbita. The n. lacrimalis carries sensory and autonomic nerve fibers to supply the gl. lacrimalis, palpebrae and tunica conjunctiva. The n. frontalis divides into r. supratrochlearis and r. supraorbitalis and conveys general sensation from the forehead, glabella, sinus frontalis, skin of the upper palpebrae and tunica conjunctiva. The orbita also receives partial innervation from the r. zygomaticus and r. infraorbitalis of the n. maxillaris (CN V2). Located towards the posterior region of the orbita is the parasympathetic ganglion ciliare which relays parasympathetic impulses and transports sympathetic and sensory impulses to structures of the orbita.
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