The trigeminal nerve is the largest cranial
nerve. It contains both sensory and motor fibers.
The motor fibers innervate the muscles of
mastication and arise from motor neurons in the
pons. The general sensory fibers convey information
regarding pain, temperature, touch, and conscious
and unconscious proprioception. At this time I want
to talk about those general sensory fibers that are
conveying PAIN and TEMPERATURE
because they are associated with a nucleus and
tract in the caudal medulla (where we are now!). We
will talk about the other general sensory nuclei
and fibers (two point discrimination, conscious
proprioception and vibratory sense), as well as the
motor fibers associated with the trigeminal, later
when we look at sections through the rostral pons.