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-contains pontocerebellar fibers,
-connects the pons to the cerebellum.
d. Superior cerebellar peduncle
-connects the cerebellum to the pons and midbrain. —contains the
dentatorubrothalamic fibers and the ventral spino-cerebellar tract.
e. Pontine nuclei
-are cerebellar relay nuclei found in the base of the pons. -give rise
to pontocerebellar fibers that constitute the middle cerebellar
4. Cranial nerve nuclei and associated tracts
a. Dorsal and ventral cochlear nuclei of CN VIII
-are found at the medullopontine junction.
b. Medial, lateral, and superior vestibular nuclei of CN VIII (see
-receive proprioceptive (SSA) input from the semicircular ducts,
utricle, saccule, and the cerebellum.
Chapter 9 Brainstem I 153
—project to the cerebellum and the ML F.
—the lateral vestibular nucleus gives rise to the lateral vestibu-
c. Medial longitudinal fasciculus (MLF)
-contains vestibular fibers of CN VIII that coordinate eye move-
ments via CN III, CN IV, and CN VI. -mediates nystagmus and
lateral conjugate gaze.
d. Abducent nucleus of CN VI (see Figure 9-6)
—underlies, in the caudal medial pontine tegmentum, the facial col-
liculus of the rhomboid foss a.
-projects exiting fibers through the trapezoid body and through the
corticospinal tract of the base of the pon s.
-gives rise to GSE fibers that innervate the lateral rectus muscle.
—gives rise to fibers that project, via the MLF, to the contralateral
medial rectus subnucleus of the oculomotor nucleus of CN III.
-is the pontine center for lateral conjugate gaze, which re-
ceives commands from the contralateral frontal eye field (area 8).
It innervates, via the MLF, the contralateral medial rectus muscle
and, via abducent fibers, the ipsilateral lateral rectus muscle to
execute conjugate lateral gaze.
e. Facial nucleus of CN VII (see Figure 9-6)
-gives rise to SVE fibers that innervate the muscles of facial
expression, -contains neurons that project axons dorsomedially,
abducent nucleus as a genu, and pass ventrolaterally between the
facial nucleus and spinal trigeminal nucleus to exit the brainstem
in the cerebellopontine ang le.
f. Superior salivatory nucleus of CN VII
-includes the lacrimal nucleus.
-gives rise to GVE preganglionic parasympathetic fibers that
synapse in the pterygopalatine and submandibular gangl ia.
g. Spinal trigeminal tract and nucleus of CN V