An outstanding characteristic of the nervous system is that neurons
make selective functional contacts. Each neuron behaves as if it
recog nizes the neurons with which it associates and rejects
associations with others. The specific interneuronal relationships
that result define the innate neuronal circuits that determine the
functioning of this system. The purpose of this volume is to
present some approaches to the problem of neuronal recognition. The
volume has been somewhat arbitrarily divided into three sections.
In the first section, the overrid ing theme is the degree of
specificity of neuronal recognition. How specific is specific? Is
the specificity so precise that the neurites of one neuron will
only make synaptic contact with a unique target neuron? If less
precise, within what range? Are the rules for specification that
are operative in the embryo still operative at the same level of
precision when connections regenerate in the mature organism? Are
they still operative in dissociated tissue grown in culture? The
second section of this volume contains reviews of morphologi cal
studies of synaptogenesis and biochemical studies of synaptic com
ponents. Can the morphology of developing cellular contacts provide
clues about selectivity? Can the chemical components of synaptic
junc tions be isolated and characterized? Do they include
resolvable compo nents that mediate neuronal recognition? The third
section contains studies seeking to identify the existence of
specific molecules that might mediate cellular recognition. A major
question here is whether molecules of this type even exist."
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