The frontal nerve is more commonly affected than the nasociliary nerve or lacrimal nerve.
2.
Sometimes the latter branch is absent, and a continuation of the lacrimal nerve is substituted for it.
3.
The lacrimal nerve is occasionally absent, and its place is then taken by the zygomaticotemporal branch of the maxillary nerve.
4.
It also carries post-synaptic parasympathetic fibers ( originating in the pterygopalatine ganglion ) to the lacrimal nerve via a communication.
5.
The zygomatic sends signals to the lacrimal nerve that activate the lacrimal gland; which is the reason that spicy foods can cause tears.
6.
One division leaves on the zygomatic division of CN V 2 and travels on a communicating branch to unite with the lacrimal nerve ( branch of the ophthalmic nerve of CN V 1 ) before synapsing at the lacrimal gland.
7.
It also sends postganglionic parasympathetic fibers to the lacrimal nerve ( a branch of the Ophthalmic nerve, also part of the trigeminal nerve ) via the zygomatic nerve, a branch of the maxillary nerve ( from the trigeminal nerve ), which then arrives at the lacrimal gland.
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