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This occurs gradually (elongated nuclei in medulla, rounder in pons and midbrain), b) The sensory nucleus of CN5 does not break up but is continuous from spinal cord through midbrain, c) The motor nucleus of CN5 is confined to the pons, d) There are three sensory nuclei in the brain stem - the vestibulocochlear complex (CN8), sensory nucleus of CN5, and nucleus solitarius. e) Solitarius is a visceral sensory nucleus (CNs 7, 9, 10). 0 The sensory nucleus of CN5 is somatic sensory (CNs 5, 7, 9, 10 and possibly others - but the predominant input is from CN5). g) aMbiguus is Motor (CNs 9, 10) h) Nucleus solitarius is solitarily confined to the medulla as are nucleus ambiguus, the nucleus of CN12, the dorsal motor nucleus of CN10 and the salivatory nuclei, i) Nuc. 8 overlaps the medulla and pons.
Also, although all divisions of CN5 enter the pons, the sensory nucleus of CN5 extends from midbrain to spinal cord (fig. 27); the nuclei of CN8 lie not only in the pons but also in the medulla (fig. 21); the nuclei and nerve entry points of CN7 are located in both pons and medulla (fig. 28).
The sensory nucleus of 5 is very long, extending into the medulla and becoming continuous with the posterior horn of the spinal cord (Fig. 21).
You see, all the motor and sensory fibers of CN5 enter the brain stem at the level of the pons; some of the sensory fibers then travel into the medulla and even the spinal cord via the spinal tract of 5 to synapse in the long sensory nucleus of 5.
The three branches of the trigeminal nerve are represented to some degree throughout the length of the sensory nucleus.
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