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NEUROLOGY 





region descend in contact with the medulla spinalis for a distance equal to the height 

 of at least two vertebrae before they emerge from the vertebral canal. 



FIG. 797. Distribution of cutaneous nerves. Ventral aspect. 



The roots of the lower lumbar and upper sacral nerves are the largest, and their 

 individual filaments the most numerous of all the spinal nerves, while the roots 

 of the coccygeal nerve are the smallest. 



