The plural of ganglion is ganglia.
A ganglion is a cluster or knot-like structure that contains nerve cell bodies. Ganglia are found throughout the nervous system and play a crucial role in transmitting and processing nerve signals. They can be categorized into different types based on their location and function. Ganglia can be sensory ganglia, which receive sensory information from the body, or autonomic ganglia, which control involuntary functions. Ganglia are essential for coordinating and regulating various bodily functions and are an integral part of the nervous system.