Clinical Features

  • F. Postacchini
  • S. Gumina


Numerous authors, using different methods, have studied the innervation of cutaneous territories by the individual spinal nerve roots. Bolk (7) studied the distribution of the cutaneous nerves during anatomic dissections to identify the nerve roots from which they originate. Head (39) analyzed the areas of cutaneous dysesthesia in patients with diseases of the nervous system. Foerster (30) identified the regions of decreased sensitivity after surgical rhyzotomy, whilst Keegan (47) studied the sensory changes in patients with a herniated disc. Hansen and Schliack (38) used data obtained by other authors with varying methods. Several dermatomal charts have stemmed from these studies (Figs. 8.1 and 8.2). Of these, the chart most closely corresponding to the true situation appears to be the Keegan’s.


Nerve Root Tibialis Anterior Lumbar Disc Radicular Pain Reflex Activity 
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  • F. Postacchini
  • S. Gumina

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