Human head transplant

In 1970, the head of the monkey was transplanted onto the body of another at the Case Western Reserve University School of Medicine in the US but they weren't able to fuse the spinal cords which means the monkey recipient couldn’t move its new head, it was able to achieve assisted breathing, but it died in a mere nine days following the procedure.

"The recipient's head is then moved onto the donor body and the two ends of the spinal cord – which resemble two densely packed bundles of spaghetti – are fused together,” says Thomsons. "To achieve this, Canavero intends to flush the area with a chemical called polyethylene glycol, and follow up with several hours of injections of the same stuff. Just like hot water makes dry spaghetti stick together, polyethylene glycol encourages the fat in cell membranes to mesh.”