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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The central localization of the vagus nerve in the ferret (Mustela putorius furo) and the mink (Mustela vison).
The location of vagal preganglionic neurones (VPN) has been determined in nine ferrets (Mustela putorius furo) and seven mink (M. vison) using neuronal tract-tracing techniques employing horseradish peroxidase (HRP) and wheat-germ agglutinin conjugated HRP (WGA-HRP) mixtures injected into the nodose ganglion of the vagus nerve. Labelled VPN were located ipsilaterally in the dorsal motor nucleus of the vagus (DmnX), nucleus ambiguus (nA), and reticular formation (rf) of the medulla oblongata. In four of the ferrets, labelled VPN were also identified in the nucleus dorsomedialis (ndm) and the nucleus of the spinal accessory nerve (nspa). In a single mink a few labelled cells were observed in the ndm but no labelled VPN were found in the nspa. Labelling of afferent components of the vagus nerve was seen in two ferrets and two mink with the best labelling obtained following an injection of an HRP/WGA-HRP mixture into the nodose ganglion. Labelled afferents were observed to cross the ipsilateral spinal trigeminal tract (SpV) before entering the tractus solitarius (TS) in regions separate from the motor axons which exit the medulla in separate fasicles. Sensory terminal fields were identified bilaterally in the nucleus of the tractus solitarius (nTS) in both species and bilaterally in the area postrema (ap) of the ferret; however, the contralateral labelling was sparse in comparison to the densely labelled ipsilateral nTS/ap. Maximal terminal labelling was seen in regions just rostral and caudal to obex in both species.
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