The surname Murchison was first found in Inverness, where they held a family seat from very ancient times. They are believed to be descended from Murdoch, a natural son of Angus Mor of Islay of the Clan Donald.
Tunneling means that a wound has channels extending from the central injury into the surrounding tissue, such as muscle and skin. These tunnels inhibit the wound's healing rate, as the flesh is unable to maintain contact long enough for the mending process to initiate.
A tunneling wound is any wound that has a channel that tunnels from the wound into/through the muscle or subcutaneous tissue. Some wounds may have more than one tunnel. Tunnels may be short and shallow or long and deep.