Cochlear nucleus to superior olive
From Webster (1992)
The cochlear nucleus is the first nucleus in the auditory nervous system, but it is a good illustration of the complexity of the pathways from the very beginning. The structures labeled MSO, LSO and MNTB are actually parts of the superior olive, the medial superior olive, the lateral superior olive and the medial nucleus of the trapezoid body. The structure through which the nerve fibers pass between the side of the brain in this vicinity is called the trapezoid body. Notice that the anterior part of the ventral cochlear nucleus (AVCN) projects to the ipsilateral LSO and the contralateral MNTB. But the AVCN also sends a second projection to the MSO. So this one part of the cochlear nucleus has already set up two different pathways. The posterior part of the ventral cochlear nucleus (PVCN) and the dorsal cochlear nucleus (DCN) bypass the LSO, MSO and MNTB and head straight up the lateral lemniscus. But notice that they branch off around the superior olive (these are called periolicvary areas).
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