autonomic (sympathetic and parasympathetic) neurons innervate and regulate the function of smooth muscle and secretory cells
in a wide number of tissues. Sensory
neurons innervate a variety of specialized sensory appendages (e.g., muscle spindles, Golgi tendon organs, Pacinian corpuscles, Ruffini corpuscles, hair follicles, touch domes) or terminate in anatomically unspecified nerve endings; each kind has precise patterns of synaptic connections in the central nervous system.