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.
Undermining: when the depth of the wound extends past the original opening. Sort of like a plastic water bottle. It differs from tunneling in that tunneling is usually in one direction, whereas undermining extends past the opening in all directions.