File:Grant 1962 663.png

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English: According to the clinical, surgical, and experimental findings of Keegan and

Garrett, the dermatomes of the limbs from the 5th cervical to the 1st thoracic, and from the 3rd lumbar to the 2nd sacral extend as a series of bands from the mid-dorsal line of the trunk into the limbs, as illustrated. When the function of even a single dorsal nerve root is interrupted, faint but definite diminution of sensitivity can be demonstrated in the dermatome. The best method to detect and plot the area of diminished sensitivity is by the use of light pin scratch for pain sensation, although it can be found for temperature and for tactile sensation also. Note: Pearson, A. A. and Bass, J. J. find that in the human embryo it is unusual for the dorsal rami of C. 6, 1 and 8 to possess cutaneous branches, for only about 10% do; and that C.5 and T.I possess them in only 67% and 82% respectively. In contrast, they do find that

in rabbit embryos each of these dorsal rami (C.5—T.I) possesses a cutaneous branch.
Source An atlas of anatomy, / by regions 1962
Author Grant, John Charles Boileau


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This work is in the public domain because it was published in the United States between 1924 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed. Unless its author has been dead for the required period, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macao), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See Commons:Hirtle chart for further explanation.

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