PART 2: Cardinal Manifestations and Presentation of Diseases
SECTION 3 Nervous System Dysfunction
23 Numbness, Tingling, and Sensory Loss
 | Figure 23-1 The main somatosensory pathways. The spinothalamic tract (pain, thermal sense) and the posterior column–lemniscal system (touch, pressure, joint position) are shown. Offshoots from the ascending anterolateral fasciculus (spinothalamic tract) to nuclei in the medulla, pons, and mesencephalon and nuclear... |
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 | Figure 23-2 The cutaneous fields of peripheral nerves. (Reproduced by permission from W Haymaker, B Woodhall: Peripheral Nerve Injuries, 2nd ed. Philadelphia, Saunders, 1953.) |
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 | Figure 23-3 Distribution of the sensory spinal roots on the surface of the body (dermatomes). (From D Sinclair: Mechanisms of Cutaneous Sensation. Oxford, UK, Oxford University Press, 1981; with permission from Dr. David Sinclair.) |
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 | Figure 23-4 Dermatomes of the upper and lower extremities, outlined by the pattern of sensory loss following lesions of single nerve roots. (From JJ Keegan, FD Garrett: Anat Rec 102:409, 1948.) |
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