Final answer:
The parasympathetic fibers in the facial nerve innervate the lacrimal gland and help with tear secretion.
Step-by-step explanation:
The nerve that goes to the lacrimal gland from cranial nerve V (CNV) and helps with tear secretion is the parasympathetic fibers in the facial nerve. These fibers activate a ganglion, which ultimately stimulates the lacrimal gland to produce tears. The lacrimal gland is responsible for secreting tears that wash across the surface of the eye to keep it moist.