<prompt> 10 year old boy burnt his back. How much of his BSA does it contribute13151916  <response>: Estimation of percentage of BSA burned Lund and Browder 10-14 yrs Head and neck -13 Front of trunk- 16 Back of Trunk- 16 Upper limb- 19 Lower limb- 34 Ref: K.S.Narayan Reddys Synopsis of Forensic Medicine and Toxicology, 29th edition, Chapter 11, Page- 160. 