The waterproof sensory sheet covering the mammalian body has a rich
afferent innervation which provides an abundance of complex information
for use by the central nervous system often in conjunction with
information from receptors in the joints. This book is an attempt to
provide a systematic account of the way in which this somatosensory
system works. The properties of the peripheral receptors have been
debated in scientific terms for about a century and the resolu- tion of
the conflict in favour of the existence of 'specific' receptors for
mechanical, thermal and noxious stimuli is reported and discussed in the
opening chapters of the book. An awareness of this specificity has
forced a re-consideration of the ways in which the central nervous
system de-codes the information which is showered upon it. Advances in
knowledge of the fine structure of the central nervous system have
raised functional questions about the operation and organisation of the
sensory systems in the spinal cord and brain. Fresh insight into the
morphological complexity of the dorsal horn and higher levels of the
nervous system gives the physiologist a clearer idea of the units with
which he works. Progress has been made in understanding the function of
sensory relay nuclei in general and indivi- dual tracts in particular
and is fully decomented.