Neuroimmunology could be defined as the application of immunological
methods to problems in neurobiology but such a definition is so all-
encompassing as to be unhelpful. It is not a precisely circumscribed
discipline but it seems worthwhile at the outset to point to three of
the major areas of activity. One rather early use of the term was in
connection with studies on the immune response to antigens in the
nervous system. This includes topics such as autoimmunity in the central
and peripheral nervous sys- tems, the response to neural tumors or viral
infections, and the im- munopathology of such processes. Although not at
the forefront of the currently fashionable preoccupation with
neuroimmunology, this area continues to be a vital and interesting one
from both clinical and basic perspectives. A second very active area is
the exploitation of antibodies to iden- tified components of neural
cells, and in particular to those molecules involved as
neurotransmitters, in transmitter synthesis and breakdown, and as
synaptic receptors. The immunohistochemical detection of these antigens
has led to new insights into the functional organization of the nervous
system, and reference to such studies is almost a sz'ne qua non for
discussions of most central and peripheral synapses.