A ganglion is a cluster of nerve cell bodies found outside of the central nervous system, forming a critical component of the peripheral nervous system. These bundles of specialized neurons serve as relay points, receiving sensory signals from various parts of the body and transmitting processed information to other parts of the system. By grouping cell bodies together, ganglia allow for localized processing and modulation of neural impulses before they are passed along the axons to the central processing centers. Variations in the size and structure of ganglia are associated with diverse types of sensory input and motor control functions.