Fig. 4-1. General view of skin and subcutaneous tissue. A, "Thin" skin from abdomen. B, "Thick" skin from pal m of hand. X, Y, and Z represent the levels of a superficial (Thiersch) graft, a split thickness graft (including one third to one quarter of the dermis), and a full thickness (Wolfe) graft, respectively. The numerals 1 to 6 represent the levels of degrees of burns, according to Dupuytren's classification. Other classifications of burns are also used.