Terminal ganglia are clusters of nerve cell bodies located near or within the organs they innervate. They are part of the parasympathetic nervous system, which is responsible for rest-and-digest functions in the body. These ganglia play a crucial role in transmitting signals that help regulate bodily functions such as digestion and heart rate. In contrast to sympathetic ganglia, which are located further from their target organs, terminal ganglia allow for more localized control. This arrangement enables precise modulation of organ function, ensuring that the body can respond effectively to various physiological needs.