Mesencephalic trigeminal sensory neurons of cat: axon pathways and structure of mechanoreceptive endings in periodontal ligament

The Journal of Comparative Neurology
M R ByersW K Dong

Abstract

We injected 3H-proline into cat brainstem in order to label the entire mesencephalic trigeminal nucleus (Mes-V) for autoradiographic analysis of the size and pathways of Mes-V sensory axons and for microscopic study of Mes-V receptor structure in dental tissue. Labeled sensory axons were found in the trigeminal motor and sensory tracts and roots; approximately equal numbers of axons were found in both roots. The sensory root and all three divisions of the trigeminal nerve contained larger Mes-V axons than the motor root. Labeled Mes-V axons were found at the ganglion in the dorsomedial (infratrochlear) branch of the ophthalmic nerve but not in the ventrolateral branch. The mean diameter of Mes-V axons in periodontal ligament was 4.0 +/- 1.9 micron compared to 7.3 +/- 2.1 micron in maxillary and mandibular nerve, suggesting axonal arborization prior to innervation of ligament. Mes-V receptors in dental tissue were confined to ipsilateral periodontal ligament close to the root apex, with greater innervation on the posterior side. Receptor incidence was moderate for most teeth; however, maxillary first and second incisors and maxillary and mandibular canines had focal areas with remarkably dense innervation. No labeled axons were ...Continue Reading

References

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Citations

Jun 8, 2000·The Journal of Comparative Neurology·E LanuzaF Martínez-García
Jul 1, 1996·The Anatomical Record·N E Lazarov, C N Chouchkov
Feb 1, 1995·Progress in Neurobiology·C HildebrandC S Johansson
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Oct 5, 2007·Brain Research Reviews·Nikolai E Lazarov
Jun 17, 2009·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Megumi OhishiTakeyasu Maeda
May 8, 2008·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Niping Wang, Paul J May
Mar 15, 2011·Acta Odontologica Scandinavica·Yan HuangIvo Lambrichts
Nov 17, 2010·Behavioral and Brain Functions : BBF·Ombretta MameliPierluigi De Riu
Apr 12, 2000·Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists·T MaedaS Wakisaka
Mar 5, 1999·Journal of Dental Research·T YamamotoS Ozono

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