However, they continue to course with the parasympathetic fibers innervating the lacrimal gland.

Oppositely, the parasympathetic fibers, where present, dilate the first set of blood vessels and constrict the second.

Nitric oxide released by parasympathetic fibers may also play a role.

During erection, this coiling is inhibited by parasympathetic fibers of the cavernous nerves.

Correction*** Deep Petrosal nerve does not have parasympathetic fibers.

It also supplies preganglionic parasympathetic fibers to several head and neck ganglia.

Only parasympathetic fibers form synapses in the ganglion.

It contains the sensory and parasympathetic fibers of the facial nerve.

Mechanism: The parasympathetic fibers to the pupil are responsible for pupillary constriction.

In stage 3, the parasympathetic fibers on both sides are paralysed - leading to bilateral pupillary dilatation.