[Afferent innervation in the cervical region of the esophagus and trachea in early postnatal ontogenesis].

Method of retrograde axonal transport of horseradish peroxidase was used to study the afferent innervation of trachea and esophagus cervical portion in the neonatal, 10-, 20- and 30-days old kittens. Labeled neurons in all the animals were localized in the vagal caudal sensory ganglion and CI-CVI spinal ganglia both in right and left sides. The major role in the innervation of trachea and esophagus cervical portion in kittens from the moment of their birth till postnatal day 20, is played by the cells of spinal ganglia, while at day 30 these are neurocytes of the vagal ganglia. No significant differences were found in the number of neurocytes, innervating the trachea and the esophagus.