Afferent projections to the oral motor nuclei in the rat
Article first published online: 9 OCT 2004
Copyright © 1983 Wiley-Liss, Inc.
Journal of Comparative Neurology
Volume 220, Issue 3, pages 280–298, 1 November 1983
How to Cite
Travers, J. B. and Norgren, R. (1983), Afferent projections to the oral motor nuclei in the rat. J. Comp. Neurol., 220: 280–298. doi: 10.1002/cne.902200303
- Issue published online: 9 OCT 2004
- Article first published online: 9 OCT 2004
- Manuscript Accepted: 12 MAY 1983
- articular formation
Projections to the trigeminal, facial, ambiguus, and hypoglossal motor nuclei were determined by using horseradish peroxidase histochemistry. Most of the afferent projections to these motor nuclei were from the brain-stem reticular formation, frequently in areas adjacent to other synergetic motor nuclei. The reticular formation lateral to the hypoglossal nucleus and reticular structures surrounding the trigeminal motor nucleus projected to each of these other brainstem motor nuclei involved in oral-facial function. Afferent projections to these motor nuclei also were organized along the ros-trocaudal axis. Within the reticular formation most of the afferent projections to the trigeminal motor nucleus originated rostral to the majority of neurons projecting to the hypoglossal and ambiguus nuclei, which in turn were rostral to the primary source of reticular afferents to the facial nucleus. In comparison, projections from the sensory trigeminal nuclei and nucleus of the solitary tract were sparse. The interneuron pools that project to the orofacial motoneurons provide one further link in understanding the brain-stem substrates for integrating oral and ingestive behaviors.