Final answer:
Clusters of nerve cell bodies in the peripheral nervous system are referred to as ganglia.
Step-by-step explanation:
Clusters of nerve cell bodies in the peripheral nervous system are called ganglia. The term ganglion (plural: ganglia) is specific for a cluster of neuron cell bodies located in the peripheral nervous system (PNS), whereas a similar structure in the central nervous system (CNS) is referred to as a nucleus. This distinction is particularly important considering the anatomical regions of the nervous system, where a bundle of axons is called a nerve in the PNS and a tract in the CNS.