The nasociliary nerve is a branch of the ophthalmic nerve (V1), which in turn arises from the trigeminal nerve.
Anatomy
The nasociliary nerve is a sensory nerve and passes through the superior orbital fissure into the orbit. The nasociliary nerve runs to the medial angle of the eye, which it supplies with its terminal branch, the infratrochlear nerve. It gives off the following branches[^1]: