Preserve Organ

Necromancy
Level: Clr 0, Drd 0, Sor/Wiz 0
Components: V, S, DF
Casting Time: 10 minutes
Range: Touch
Effect: One organ
Duration: 24 hours
Saving Throw: Fortitude negates (harmless)
Spell Resistance: Yes

The caster preserves a single severed organ from a living creature so that it does not decay or rot. Evil casters use preserved organs as material spell components. There are ritual uses for body parts as well. The organ is kept in the exact state it was in when the spell was cast. If a heart is still beating and bloody, for example, then it remains that way.

(Book of Vile Darkness, p101)