| Abstract: | A study of the origin of the sympathetic postganglionic axons innervating the trachealis muscle of the dog was carried out using horseradish peroxidase as a retrograde neuronal marker. It was demonstrated that this technique is not fruitful in adult dogs, but in 12 puppies demonstrated that these neurons arise from the cervicothoracic, middle cervical and cranial cervical ganglia. Contributions of nucleus ambiguus, nucleus of the vagus nerve and the distal ganglion of the vagus nerve to innervation of the trachealis muscle were also demonstrated. |
