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No established medical rule says a proposed head transplant should be cut at the chest rather than the jaw. The chest-versus-jaw framing is an argument, not a clinical recommendation: trauma surgeons use landmarks such as the sternal notch and angle of the mandible to describe neck injuries, but those zones do not define transplant sites. More fundamentally, the central challenge is not choosing a boundary. It is whether a transplanted head could regain meaningful function through spinal cord reconnection—a problem the reviewed literature describes as unresolved.
What does “chest, not jaw” mean?
“Head transplant” is shorthand for a much broader proposed head-to-body procedure. The choice of anatomical boundary might sound like the main decision: remove the head near the jaw or include the neck and attach it at the chest. But a viable result would require much more than attaching blood vessels or physically supporting the head. In particular, the spinal cord would need to be reconnected in a way that restored useful neurological function.
The exact chest-versus-jaw rule is not established in the medical sources discussed here. Without an identifiable clinical recommendation behind it, it should be read as a proposed framing rather than settled surgical guidance.
Why neck injury zones do not answer the transplant question
Trauma literature divides the neck into zones using anatomical landmarks, including the sternal notch, cricoid cartilage, angle of the mandible and skull base. These zones help classify penetrating neck injuries; they are not instructions for where to perform a proposed transplant. The distinction matters because a familiar surgical landmark does not establish that an operation at that level is feasible or clinically appropriate. See the 2015 WSES position paper on neck trauma.
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The unresolved problem is spinal cord reconnection
A 2016 historical review identifies several technical challenges: maintaining blood flow to an isolated brain, immunosuppression, spinal anastomosis and fusion after cord transection, and pain control. It says, “However, there is currently sparse evidence in favor of successful spinal anastomosis and fusion after transection.” The review notes that evidence rests largely on older animal-model work, whose relevance to humans is uncertain. The history of head transplantation: a review.
A 2017 review of surgical, ethical and psychosocial issues likewise describes spinal cord reattachment as a major hurdle, reporting that prior attempts had not restored function in the context of head transplantation. It also raises concerns about evidence quality, patient vulnerability and informed consent, including the consequences for a recipient if functional spinal reconnection is not achieved. The review of surgical, ethical, and psychosocial considerations.
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A separate critical review published in 2019 stated that, at that time, no successful head-to-body transplant with spinal cord reconnection had been achieved in humans or non-human animals. That statement is time-limited to the review’s publication; it should not be treated as independent verification of every development since 2019. The 2019 critical review.
How to assess claims about a proposed procedure
Animal experiments, cadaveric rehearsal, published proposals and successful clinical outcomes in living people are different kinds of evidence. A demonstration of one technical step does not by itself show that a complete procedure can restore useful function or that its risks and ethical basis are acceptable.
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- Anatomical level: Does the claim specify where the proposed attachment would occur, and is that level supported by a clinical source rather than borrowed from injury-zone terminology?
- Spinal cord plan: Does it explain how the cord would be reconnected and what functional recovery was actually demonstrated?
- Evidence type: Is the claim based on animal work, cadaveric rehearsal, a proposal, or a completed procedure in a living human?
- Outcome: Does the evidence report meaningful neurological function, rather than only blood-flow support or technical attachment?
- Ethics and regulation: Does it address informed consent, patient vulnerability, the possibility of no functional reconnection, and an appropriate ethical and regulatory basis?
Is a head transplant possible?
The reviewed literature documents proposals and technical investigations, but it does not establish a successful procedure that restored spinal cord function after head-to-body transplantation. Because functional spinal reconnection is central to the outcome, neither a chest-level nor a jaw-level boundary can be presented as a proven solution. No success rate or patient risk figure is established by the sources cited here.
Quick Recap
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