Introduction: control of the autonomic nervous system and the multiple integrative roles it plays in regulating cardiovascular functions.

Interest in the control and action of the autonomic nervous system on cardiovascular system function has waxed and waned over the years [3]. At present it has reached a new intensity. Old concepts are being reinvestigated and new fields are being explored. As is usually the case in physiology, many are following a reductionist approach and studying the minutia of structure and function of autonomic neurons and neuron complexes. Others are approaching the totality and dealing with the autonomically controlled cardiovascular components of reactions and behavior. The topics chosen for discussion in this symposium are representative of those under intensive consideration at the present time.