[TA] a branch of the trigeminal nerve that passes forward from the trigeminal ganglion in the lateral wall of the cavernous sinus, entering the orbit through the superior orbital fissure; through its branches, frontal, lacrimal, and nasociliary, it supplies sensation to the orbit and its contents, the anterior part of the nasal cavity, and the skin of the nose and forehead. SYN: nervus ophthalmicus [CN V1] [TA].