The organization of the gastric efferent projections in the brainstem of monkey: an HRP study.
Topographic localization of neurons in the dorsal motor nucleus (DMN) of the vagus innervating the stomach and the extent of central decussation of its fibers were investigated in the monkeys after chronic unilateral cervical vagotomy. This study presents findings in regard to the non-topographic representation of the stomach in both DMN and lack of a well-defined decussation of its fibers in the brainstem of monkeys. Reported findings in the rat and cat vis-a-vis our own results in the monkey indicate species difference in the organization of efferent vagal gastric fibers. The evidence of a very small number of HRP-labeled cells in DMN on the vagotomized side after intervals of 2-36 weeks is being reported here, for what we believe to be the first time, and its significance has been discussed.
D000818:Animals; D001931:Brain Mapping; D001933:Brain Stem / Q000033:anatomy & histology*; D008252:Macaca fascicularis; D009046:Motor Neurons; D009476:Neurons, Efferent; D013270:Stomach / Q000294:innervation*; D014628:Vagotomy; D014630:Vagus Nerve / Q000033:anatomy & histology*