Parasympathetic ganglia are clusters of nerve cell bodies located in the parasympathetic nervous system, which is part of the autonomic nervous system. These ganglia play a crucial role in regulating bodily functions during restful states, such as digestion and energy conservation. They are typically found near or within the organs they innervate, allowing for efficient communication between the nervous system and target tissues. The main types of parasympathetic ganglia include terminal ganglia and intramural ganglia. Terminal ganglia are located close to the organs, while intramural ganglia are embedded within the walls of the organs themselves. Together, they help facilitate the body's "rest and digest" responses.