Brainstem cells of origin of physiologically identified cardiopulmonary nerves in the rhesus monkey (Macaca mulatta)
Abstract
The distributions of brainstem cells of origin of the cervical vagus nerve, its cervical and thoracic branches, and of neurons projecting to the cricothyroid muscle and the stomach wall were identified and compared following injections of horseradish peroxidase (HRP) in 18 Rhesus monkeys. Physiologically and/or anatomically identified cardiopulmonary nerves were injected with 3-20 microl of HRP to identify the locations of vagal preganglionic cardioinhibitory neurons in 10 of these monkeys. After injections into cardiopulmonary nerves, retrogradely labelled cells were concentrated ipsilaterally in the most lateral parts of the dorsal motor nucleus of the vagus nerve (DMV) and in the ventrolateral nucleus ambiguus (NA). Fewer labelled neurons were identified close to or in the principal (dorsal) division of the NA and in the intermediate zone between the DMV and NA. The results indicate that monkey cardiopulmonary nerves have multiple origins; their somata are located primarily in the ventrolateral NA and to a lesser extent in the lateral DMV. In monkeys, there is a stronger representation in the lateral DMV than in cat, dog and pig. The viscerotopic organization of the cells of origin of primate vagal nerves is similar to that ...Continue Reading
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