Physiologyand physio pathology of decapitation.

 Physiologyand physio pathology of decapitation.

Not for the faint hearted, more for science geeks like me. 
Decapitation, also known as beheading, is the total separation of the head from the body. Such an injury is invariably fatal to humans and most other animals, since it deprives the brain of oxygenated blood, while all other organs are deprived of the involuntary functions that are needed for the body to function
The term beheading refers to the act of deliberately decapitating a person, either as a means of murder or as an execution; it may be accomplished with an axe, a sword, a knife, a machete or by mechanical means such as a guillotine or chainsaw. An executioner who carries out executions by beheading is sometimes called a headsman. 
Less commonly, decapitation can also refer to the removal of the head from a body that is already dead. This might be done to take the head as a trophy, for public display, to make the deceased more difficult to identify, for cryonics, or for other, more esoteric reasons.

Pain
If the headsman's axe or sword was sharp and his aim was precise, decapitation was quick and was presumed to be a relatively painless form of death. If the instrument was blunt or the executioner was clumsy, multiple strokes might be required to sever the head, resulting in a prolonged and more painful death. The person to be executed was therefore advised to give a gold coin to the headsman to ensure that he did his job with care. Robert Devereux, 2nd Earl of Essex, and Mary, Queen of Scots  required three strikes at their respective executions. The same could be said for the execution of Johann Friedrich Struensee, favorite of the Danish queen Caroline Matilda of Great Britain. Margaret Pole, 8th Countess of Salisbury, is said to have required up to 10 strokes before decapitation was achieved. This particular story may, however, be apocryphal (since highly divergent accounts exist). Historian and philosopher David Hume, for example, relates the following about her death. 
She refused to lay her head on the block, or submit to a sentence where she had received no trial. She told the executioner, that if he would have her head, he must win it the best way he could: and thus, shaking her venerable grey locks, she ran about the scaffold; and the executioner followed her with his ax, aiming many fruitless blows at her neck before he was able to give the fatal blow. 
To ensure that the blow would be fatal, executioners' swords usually were blade-heavy two-handed swords. Likewise, if an axe was used, it almost invariably was wielded with both hands. In England a bearded axe was used for beheading, with the blade's edge extending downwards from the tip of the shaft.

Finland's official beheading axe resides today at the Museum of Crime in Vantaa. It is a broad-bladed two-handed axe. It was last used when murderer Tahvo Putkonen was executed in 1825, the last execution in peacetime in Finland.

Physiology of death by decapitation
Decapitation is quickly fatal to humans and most animals. Unconsciousness occurs within 10 seconds without circulating oxygenated blood (brain ischemia). Cell death and irreversible brain damage occurs after 3–6 minutes with no oxygen, due to excitotoxicity. Some anecdotes suggest more extended persistence of human consciousness after decapitation, but most doctors consider this unlikely and consider such accounts to be misapprehensions of reflexive twitching rather than deliberate movement, since deprivation of oxygen must cause nearly immediate coma and death ("[Consciousness is] probably lost within 2–3 seconds, due to a rapid fall of intracranial perfusion of blood")

A laboratory study testing for humane methods of euthanasia in awake animals used EEG monitoring to measure the time duration following decapitation for rats to become fully unconscious, unable to perceive distress and pain. It was estimated that this point was reached within 3–4 seconds, correlating closely with results found in other studies on rodents (2.7 seconds, and 3–6 seconds). The same study also suggested that the massive wave which can be recorded by EEG monitoring approximately one minute after decapitation ultimately reflects brain death. Other studies indicate that electrical activity in the brain has been demonstrated to persist for 13 to 14 seconds after decapitation. 

Although head transplantation by the reattachment of blood vessels has been successful with animals, a fully functional reattachment of a severed human head (including repair of the spinal cord, muscles, and other critically important tissues) has not yet been achieved.

Technology
Guillotine

Aristocratic heads on pikes — a cartoon from the French Revolution
Early versions of the guillotine included the Halifax Gibbet, which was used in Halifax, England, from 1286 until the 17th century, and the "Maiden", employed in Edinburgh from the 16th through the 18th centuries.

The modern form of the guillotine was invented shortly before the French Revolution with the aim of creating a quick and painless method of execution requiring little skill on the part of the operator. Decapitation by guillotine became a common mechanically assisted form of execution.

The French observed a strict code of etiquette surrounding such executions. For example, a man named Legros, one of the assistants at the execution of Charlotte Corday, was imprisoned for three months and dismissed for slapping the face of the victim after the blade had fallen in order to see whether any flicker of life remained. The guillotine was used in France during the French Revolution and remained the normal judicial method in both peacetime and wartime into the 1970s, although the firing squad was used in certain cases.

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