Fascinating New York Times article about face transplants.

It is possible to remove not just skin and subcutaneous fat and muscle but, in the instance of those recipients who have lost some of their skeletal structure, part of the donor\’s bone and cartilage as well.
…
With the recipient\’s scar tissue removed and the essential arteries and veins exposed, surgeons would attach them to the corresponding arteries and veins in the harvested face in order to supply both nourishment and drainage.

Sounds really gruesome.