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The embryonic explanation for dermatome distributions
  1. P D Welsby
  1. Regional Infectious Diseases Unit, Western General Hospital, Crewe Road South, Edinburgh EH4 2XU, UK;

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    In clinical practice it helps if you can imagine the patient in the “embryonic position”. This is easier to do for the upper limbs as these could be placed in such a position. During growth the lower limbs move through 90 degrees to point anteriorly and at the same time rotate so that the plantar surface of the feet face downwards.