Vagal afferent fibers excite upper cervical neurons and inhibit activity of lumbar spinal cord neurons in the rat.
Qing-Gong F, Chandler MJ, McNeill DL, Foreman RD. Vagal afferent fibers excite upper cervical neurons and inhibit activity of lumbar spinal cord neurons in the rat. Pain. 1992 Oct; 51(1):91-100.