By Alice S. Weissfeld
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Extra resources for Cumitech 2B : Laboratory Diagnosis of Urinary Tract Infections
There was no histological verification of these lesions because all the patients survived; and this leaves a small margin of uncertainty even in this case which supports the classical view because some damage may conceivably have been done to the neighbouring dorsolateral fascicle. These limits in clinical investigation make it difficult to refute the challenging proposal by Wall ( 1 9 7 0 ) that the dorsal column is not itself a sensory tract, but rather is concerned in steering other systems to acquire sensory information - not, anyway, if we consider only human evidence.
One would expect that specialized tasks could be found for which their presence was actually necessary; and Vierk ( 1 9 7 4 ) has identified one of these, namely the ability to detect the direction of passive movement of an object across the skin, which is never recovered after section of the columns (see also Brinkman and Porter, 1 9 7 8 ) . Their involvement in more complex spatiotemporal tasks is emphasized by the complete loss of ability to discriminate cut-out shapes after dorsal column section (Azulay and Schwartz, 1 9 7 5 ) - an active recognition test containing some components of stereognosis.
J. L. Ochoa, and F. V. McCann (1979). Paresthesiae: Abnormal impulse generation in sensory nerve fibres in man. Acta Physiol. , 105, 518-520. Vallbo, A. , and R. Johansson (1976). Skin mechanoreceptors in the human hand: an inference of some population properties. In Y. ), Sensory functions of the skin in primates, Pergamon Press, Oxford, pp. 185-199. Weber, Ε. H. (1835). über den Tastsinn. Arch. Anat. Physiol, wiss. , 152-159. Weinstein, S. (1968). Intensive and extensive aspects of tactile sensitivity as a function of body part, sex and laterality.