<prompt> An adult old man gets burn injury to his hands. Over a few weeks, the burned skin heals without the need for skin grafting. The most critical factor responsible for the rapid healing in this case is -Remnant skin appendagesUnderlying connective tissuesMinimal edema and erythemaGranulation tissue  <response>: The skin consists of two layers1. EpidermisMost superficial layer of the skin. It is constantly replaced from the basal layer.2. DermisIt is thicker than epidermis and supplies the strength and integrity to the skinIt has a rich blood supplyIt contains adnexal structures i.e. Hair follicles, Sebaceous glands, Sweat glands.The importance of these adnexal structures is that they contain epithelial cells that can proliferate and can heal a partial thickness wound by epithelialisation.Superficial burnsInvolve only epidermis and superficial dermisThe adnexal structures are left intact so they can heal by epithelialisation.Deep burnsIn deep burns, all the adnexal structures are lost so they can only heal by secondary intention with scarring.Presence of granulations simply indicate healing, one cannot tell whether it is healing by primary intention or by secondary intention. 