In central and south america the first direct evidence of this practice dates to about the 2nd millennium b c.
Trepanning. Trepanation is really an old term also known as trephination according to dr. The goal of trepanning is to expose the tough and inflexible dura mater or pachymeninx which is the outermost layer of the meninges surrounding the brain and spinal cord. In many cases trepanning is meant to be a roughing operation to be honed for finish or machined further. To bore or otherwise make a hole in the skull as in certain prehistoric cultures or in surgery using a trephine.
To bore a shaft with a trepan. Trepanning is a technique used for drilling larger hole diameters where machine power is limited as it is not as power consuming as conventional drilling where the entire hole is converted into chips. Trepanning is a drilling process that leaves a core. Trepanning also known as trepanation trephination trephining or making a burr hole the verb trepan derives from old french from medieval latin trepanum from greek trypanon literally borer auger is a surgical intervention in which a hole is drilled or scraped into the human skull.
The trepanning tool does not machine the whole diameter only a ring at the periphery. Dating to the dawn of civilization and spanning the globe trepanning was practiced in france nearly 10 000 years ago and evidence of it has been found in azerbaijan that dates back to 4 000 b c. In other cases the trepanned hole is fit for use as drilled. During the greek age hippocrates taught trepanning.
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