Nervous and mental diseases . e a definiteknowledge of the relation ofcutaneous sensitiveness and painto visceral disease. Heads work,abundantly verified, clearly showsthat the superficial surface of thebody is in relation with the vis-cera through the spinal arising in the visceralportion of a vertebral segmentgives rise to pain referred to thebody or somatic area. Similarly,disease of the spinal segmentsgives rise to pain and othersensory disturbances in the skin,as already pointed out, and inthe associated viscera. Macken-zie2 insists that the viscera areinsensitive and that
Nervous and mental diseases . e a definiteknowledge of the relation ofcutaneous sensitiveness and painto visceral disease. Heads work,abundantly verified, clearly showsthat the superficial surface of thebody is in relation with the vis-cera through the spinal arising in the visceralportion of a vertebral segmentgives rise to pain referred to thebody or somatic area. Similarly,disease of the spinal segmentsgives rise to pain and othersensory disturbances in the skin,as already pointed out, and inthe associated viscera. Macken-zie2 insists that the viscera areinsensitive and that pain is felt-through the cerebrospinal nervesalone. That, for instance, the well-known tenderness over the liver readily elicited by pressure in diseaseof that organ is in fact confined to the skin and muscles of the abdominalwall. These areas, as mapped out by Head, with their maximal pointsfor the body and limbs, are presented in figure 20 (A, B, C), and thefollowing table shows the relation of the viscera to these areas :. Fig. 19.—Application of the scheme to the trunk(BriSBaud). Anesthesia is indicated by horizontallines: hyperesthesia by diagonal lines. Table Showing Areas of Pain Referred from Visceral Disease. Heart.—First, 2d, 3d, dorsal — First, 2d, 3d, 4th, 5th —Sixth, 7th, 8th, 9th dorsal; cardiac end from 6th and 7th. Pyloric end from —(A) Down to upper part of rectum. Ninth, 10th, J lth, and 12th dorsal.(B) Rectum. Second, 3d, and 4th and Gall-bladder.—Seventh, 8th, 9th. 10th 6th dorsal. 1 Head, Brain, lvi. Brain, 1902. 5$ NEEVOUS AND MENTAL DISEASES.
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