Myers B, Donovan W
Plast Reconstr Surg. 1976 Sep;58(3):314-6. doi: 10.1097/00006534-197609000-00010.
The blood supply of random skin flaps in the pig is mainly in a microvascular plexus in the deeper layer of the dermis. However, there is vasculature in both the dermis and the subcutaneous fat, with good collaterals between the two systems.