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Anaesthesia => Pain => Trepanning
Trepanning
Trepanning, in surgery, removal of a disc of bone from the skull to provide entrance to the brain or to relieve intracerebral pressure. The procedure is done most often in cases of bleeding between the brain and the skull. Collections of blood of this kind, if not evacuated, may compress the underlying brain and cause damage or even death. The cranial bones are cut with a small cylindrical saw, called a trepan or trephine, equipped with a centre pin. The centre pin extends a short distance beyond the blade of the saw and is inserted first to prevent slippage. In modern surgery the disc is replaced by a metal plate after the operation is completed.
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