Group of nerve cells (outside or inside the central nervous system) conveying information from the environment (touch, temperature, vision), or from the body (muscle length), to a group of nerve cells in the spinal cord (autonomic ganglion) connecting preganglionic and postganglionic nerve fibers of the autonomic nervous system.
See Autonomic nervous system (ANS), Central nervous system (CNS), Cones and rods, Dorsal root ganglia (DRG), Ectoderm, Fovea, Motoneuron, Nicotine, Placode, Retina, Vestibular system