A full thickness skin graft includes the complete dermis, whereas a split thickness skin graft comprises a varying amount of dermis. The thicker is the dermal component, the closer to normal are the characteristics of the graft. During healing over the first day, the graft receives nutrition and oxygen from the interstitial fluid of the wound base. During the following week, new blood vessels joining with the capillaries of the graft start growing from the wound base. The skin graft donor site will heal by epithelization from the edges of the site and at the center by accessory organs.