Basal plate neuroblasts give rise to the abducens nucleus, which forms the general somatic efferent fibers ( GSE ); the facial and motor trigeminal nuclei, which form the special visceral efferent ( SVE ) column, and the superior salivatory nucleus, which forms the general visceral efferent fibers of the facial nerve.
42.
It runs on the lateral wall of the cavernous sinus, where it is joined by the other two extraocular nerves ( oculomotor-cranial nerve III and abducens-cranial nerve VI ) and the first two branches of the trigeminal nerve ( V ), Ophthalmic ( V1 ) and Maxillary ( V2 ).
43.
For example, r2 has been shown to give rise to the trigeminal ganglion, while r4 has been shown to give rise to the geniculate gangion as well as spiral and Scarpa's ganglia . r5 and r6 gives rise to the abducens nerve, and the lower part of r6 and the upper part of r7 gives rise to the petrosal ganglion.
44.
If the lesion affects the PPRF ( or the abducens nucleus ) and the MLF on the same side ( the MLF having crossed from the opposite side ), then the " one and a half syndrome " occurs which, simply put, involves paralysis of all conjugate horizontal eye movements other than abduction of the eye on the opposite side to the lesion.
45.
The portion of the midbrain from where this tract originates is the superior colliculus, which receives afferents from the visual nuclei ( primarily the oculomotor nuclei complex ), then projects to the contralateral ( decussating dorsal to the mesencephalic duct ) and ipsilateral portion of the first cervical neuromeres of the spinal cord, the oculomotor and trochlear nuclei in the midbrain and the abducens nucleus in the caudal portion of the pons.
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