Localization of masticatory motoneurons in the trigeminal motor nucleus of the guinea pig.
The myotopical arrangement of masticatory motoneurons was examined in the guinea pig by the horseradish peroxidase method. The trigeminal motor nucleus was composed of dorsolateral and ventromedial divisions; the former was seen in the whole rostrocaudal extent of the nucleus, while the latter was present at levels of the caudal two thirds of the nucleus. The jaw-closer motoneurons were located in the dorsolateral division, and the jaw-opener motoneurons (mylohyoid and anterior digastric motoneurons) were seen in the ventromedial division.
D000818:Animals; D001370:Axonal Transport; D006168:Guinea Pigs; D006735:Horseradish Peroxidase; D008409:Mastication; D008410:Masticatory Muscles / Q000294:innervation*; D009046:Motor Neurons / Q000502:physiology*; D014278:Trigeminal Nuclei / Q000033:anatomy & histology*
D006735:Horseradish Peroxidase