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In the archives of the Royal College of Physicians (RCP) are five large volumes containing hundreds of the original sketches and photographs created by Sir Henry Head, FRS (1861–1940), physician to the London Hospital, editor of Brain from 1910 until 1925, and at that time one of England’s foremost neurologists (figure 1). A few further original sketches are in the Wellcome Library, and doubtless there may be some others in collections elsewhere.
Head’s sketches, drawn free hand in their entirety or as additions to preprinted body outlines, depict the cutaneous eruption suffered by some of the 450 patients with herpes zoster infection ‘that have come under…personal observation’ (Head and Campbell, p396).1 Many of the sketches formed the basis for the printed illustrations in Head’s famous publications on zoster which appeared in Brain over a hundred years ago and which proved crucial to ‘one of the earliest representations of the pattern of peripheral sensory dermatomes … [and] was but one of Sir Henry’s major contributions to sensory physiology’.2 Indeed, the first of Head’s composite maps of these dermatomes is likely to be the beautifully coloured illustration at the opening of volume RCP 329 in the Royal College of Physicians collection, with its legend ‘Tentative suggestions  for distribution of Posterior Roots’ (figure 2).
Head followed up 21 patients until their death, whereupon his colleague A W Campbell, pathologist to the Lancashire County Asylum at Rainhill, undertook a neuropathological study which included examination of the spinal cord, ganglia and roots, and sometimes the peripheral nerves, enabling the relationship between the rash and the …
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