  An approximate model of the spacetime foam is offered in which a quantum
handle (wormhole) is a 5D wormhole-like solution. Neglecting the linear sizes
of the wormhole throat we can introduce a spinor field for an approximate and
effective description of the foam. The definition of the spinor field can be
made by a dynamic and non-dynamic ways. In the first case some field equations
are used and the second case leads to superspace. It is shown that : the
spacetime with the foam is similar to a dielectric with dipoles and
supergravity theories with a non-minimal interaction between spinor and
electromagnetic fields can be considered as an effective model for the
spacetime foam.
