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Experimental morphological studies on central projection of snout proprioceptive afferents in moles






Kokubyo Gakkai Zasshi. Journal of the Stomatological Society, Japan 54(1): 208-232

Experimental morphological studies on central projection of snout proprioceptive afferents in moles

It had beeen proved that the facial nerve of moles contained a proprioceptive fiber element. But the projection areas remained unknown. They were here investigated by the Nauta method and HRP labelling method and by electron microscopy. The proprioceptive afferent fibers, after entering the pons, are divided rostro-caudally into the shorter ascending and the longer descending roots, both running closely dorsal to the trigeminal spinal tract nucleus (TSTN). The ascending root takes the vertical course adjacently dorsal to the TSTN, giving off many terminal fibers to it and the other dorso-medial pontine nuclei. At the level of the inner genu, it turns medially to meet the facial motor root and runs to the facial motor nucleus cells bilaterally. The decending root takes the vertical course caudally at least down to C3, giving off many terminal fibers to the TSTN, and the nuclei of IXth, Xth and XIIth cranial nerves. At the level of the spinal cord, the root is divided into two and they descend bilaterally through the posterior fasciculi, projecting to the posterior and anterior horn cells. From these results, it can be emphasized that the snout proprioceptive fibers project bilaterally to the facial motor nucleus and the cervical motor neurons, the latter composing a mono-synaptic reflex system between the snout muscles and neck muscles.

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Accession: 005424584

PMID: 3475383



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