A<unk>  is an experimental surgical operation involving the grafting of one organism's<unk>  onto the body of another. In many experiments, the recipient's<unk>  has not been removed, but in others it has been. Experimentation in animals began in the early 1900s. , no lasting successes have been achieved.
Head transplant
Brain transplant
Astragalectomy
Cranioplasty
Ablative brain surgery
Frontal sinus trephination
Transsphenoidal surgery
Brain implant