. The Journal of comparative neurology and psychology. ne camels-hair brush are not felt;the hair-clad parts may or may not react to such stimuli, dependingupon the location of the lesion; parts of these fingers will not besensitive to temperature stimuli, and perhaps not to pressure; theremay, or may not, be sensations from pricks of a pin ; and if the ^Ileacl and Tlionipson : The Grouping of Afferent InLpnlses within the SpinalCord. Brain, 1900, Vol. 29, p. 551. no Journal of Co?nparative Neurology and Psychology. fingers can not be moved voluntarily there will be a loss of sensibilityto mov
. The Journal of comparative neurology and psychology. ne camels-hair brush are not felt;the hair-clad parts may or may not react to such stimuli, dependingupon the location of the lesion; parts of these fingers will not besensitive to temperature stimuli, and perhaps not to pressure; theremay, or may not, be sensations from pricks of a pin ; and if the ^Ileacl and Tlionipson : The Grouping of Afferent InLpnlses within the SpinalCord. Brain, 1900, Vol. 29, p. 551. no Journal of Co?nparative Neurology and Psychology. fingers can not be moved voluntarily there will be a loss of sensibilityto movement passively produced. Some of these effects may be foundover a variable extent of the palm and the back of the hand. Inrig. 1 is given the condition found in a man following an operationin which part of the ulnar nerve was excised. The area insensitiveto light touch and to the intermediate degrees of temperatures in-cluded all the little finger, about three-quarters of the ring finger,and about two-fifths of the palm and back of the hand. Part of. Fig. 1.—The extent of loss of sensation following the division of the ulnarnerve at the elbow. The part marked with horizontal lines was insensitiveto light touches, and to intermediate degrees of temperatures. The verticalline area (cross-hatched on account of its being included within the areainsensitive to touch), was, in addition, insensitive to pressures and to from Head and Sherreu. this area was insensitive to deep touch and no sensation was got fromthe vibrations of a tuning fork. This area was also analgesic. In this and other cases in which losses of sensibility were found,the ability to appreciate touch was tested with a wisp of cotton woollightly brushed over the parts. When such a piece of cotton woolis carried over the skin of a normal individual, there is a distinctfeeling of touch, which is magnified, perhaps altered, whereverthe hairs are touched. The cotton wool should be very lightlygrouped in a b
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