The Black Dahlia Murder - Unhallowed

The next major step is complete evisceration of the carcass.
To begin, make a cut from the solar plexus, the point between the breastbone and stomach, almost to the anus.
Be very careful not to cut into the intestines, as this will contaminate the surrounding area with bacteria and possibly feces (if this does happen, cleanse thoroughly).
A good way to avoid this is to use the knife inside the abdominal wall, blade facing toward you, and making cautious progress.
Make a cut around the anus, or "bung", and tie it off with twine.
This also prevents contamination, keeping the body from voiding any material left in the bowel.
With a saw, cut through the pubic bone, or "aitch".
The lower body is now completely open, and you can begin to pull the organ masses (large and small intestines, kidneys, liver, stomach) out and cut them away from the back wall of the body.