Memory is not limited to the brain. It is also associated with other parts of the nervous system, such as the heart ganglia and abdominal ganglia. After a head transplant you may get two personalities fighting for the same body. Below is an article about the sort of thing that can happen after the transplant of a single organ.

I'm sure someone posted this a while ago in the Lost Posts, but here it is again:

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Do hearts have memories? Transplant patient gets craving for food eaten by organ donor
By Richard Shears for MailOnline - 23 December 2009

A transplant patient has developed an insatiable craving for junk food - after receiving a new heart from a teenager with a taste for fatty snacks.

David Waters is the latest example of an extraordinary phenomenon which sees some transplant recipients take on the characteristics of the donor.

Before being given the heart of 18-year-old Kaden Delaney, who was left brain dead after a car crash, Mr Waters, 24, had 'no desire at all' for Burger Rings, ring-shaped hamburger-flavoured crisps.

It was two years before he found out why the cravings had started suddenly after his operation.

Kaden's family tracked him down to see who had benefited from their son's heart,

and they began exchanging emails. A curious Mr Waters then asked: 'Did Kaden like Burger Rings? That's all I seemed to want to eat after my surgery.'

He was astonished to hear that he ate them daily.

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http://www.dailymail.co.uk/news/article-1237998/Heart-transplant-patient-gets-craving-food-eaten-organ-donor.html