The lacrimal nerve is a branch of the ophthalmic nerve that enters the orbit through the superior orbital fissure above the common annular tendon. It provides sensory innervation of the lacrimal gland, conjunctiva, and the lateral part of the eyelid. It receives parasympathetic secretomotor fibers for tear secretion in the lacrimal gland from the zygomatic nerve (a branch of the maxillary nerve). The cell bodies of the postganglionic parasympathetic fibers innervating the lacrimal gland are located in the pterygopalatine ganglion.