Herbert Mayo, M.D. (3 April 1796 – 28 June 1852), was a British physiologist, anatomist and medical writer.Mayo was born in Queen Anne Street, London, the third son of John Mayo. He entered Middlesex Hospital as a surgical pupil on 17 May 1814, and was a pupil of Sir Charles Bell (1812–15). He also studied at the Leyden University, where he graduated with a D.M. degree. He became house-surgeon at Middlesex Hospital in 1818, and M.R.C.S. in 1819. In August 1822 appeared the first part of the Anatomical and Physiological Commentaries, a work which is remarkable as containing Mayo's assertion of his discovery of the real function of the nerves of the face, and his account of the experiments which proved it. This was the starting point of a bitter and prolonged controversy with Sir Charles Bell, the discoverer of the distinction between sensory and motor nerves. Dr. Whewell, in a letter to the London Medical Gazette dated 11 December 1837, describes the discovery as having been made by Bell, Mayo, and Majendie, the two latter physiologists having corrected and completed the researches of the former. His claim was elaborated by Dr. Druitt: Less