<prompt> The principle that in the spinal cord the dorsal roots are sensory and ventral roots are motor is known as:Weber fechner lawBell Magendie LawSensation lawLaw of projection  <response>: The principle that in the spinal cord the dorsal roots are sensory and ventral roots are motor is known as Bell Magendie law. Ref: Ganongs, Review of medical physiology, 21st Edition, Page 129. 