Physiology of Tympanic Skin Grafting
A tympanic skin graft stretches across the middle ear. Its bed lies peripherally and consists of the denuded rim of drum, annulus and adjacent canal wall. It flourishes after endothelial vascular buds grow from the bed out into the graft and make continuity with the graft blood vessels to form its permanent blood supply. This occurs about the 4th to 10th day.
Fig. 1.—Vascular supply of skin, demonstrating necessity of three-fourth-thickness to full-thickness skin graft in order to obtain adequate vascular supply for tympanic graft.