It is now established that neuroglia are the intimate partners of neurons and that neuronal function is a result of neuron-glia interrelations at several levels of organization. The literature shows that the study of phylogeny has contributed a deeper understand ing of the complex functions of the neuroglia and the neuron-glia unit. It is the purpose of Neuron-Glia Interrelations During Phylog eny: I. Phylogeny and Ontogeny of Glial Cells, as well as its compan ion volume Neuron-Glia Interrelations During Phylogeny: II. Plasticity and Regeneration, to present to the scientific community a...

It has been established that neuroglia are involved in early neu ronal growth, differentiation, and migration; these issues are well discussed in the companion volume entitled Neuron-Glia Interrela tions During Phylogeny: I. Phylogeny and Ontogeny of Glial Cells. The present volume, Neuron-Glia Interrelations During Phylogeny: II. Plas ticity and Regeneration, focuses on two aspects: (1) neuron-glia inter relations as they relate to the physiological and metabolic homeostasis of neurons; and (2) the role of neuroglia and neuronal plasticity in regeneration and aging. Neuron-Glia...