[The origins of the formation of the initial portion of the vertebral nerve in the cat].

Retrograde transport of horse radish peroxidase revealed the sources of forming of the initial part of the vertebral nerve in cat. The enzyme was applied on the central region of the nerve near its outlet in ganglion stellatum. Most nerve fibers the vertebral nerve contains are the processes of neurons in ganglion stellatum. Bodies of the labeled neurons in the ganglion are located in the area, attached to the site of the vertebral nerve outlet. It also contains certain number of the afferent fibers of the II-VII thoracic segments spinal ganglia. Axons of motor neurons, the bodies of which are located in ventral cornua of the spinal cord II thoracic segments may also be present. Thus, the cat vertebral nerve is mixed in the site of its forming.