  We propose an effective action for a p'-brane with open p-branes ending on
it. The action has dual descriptions similar to the commutative and
non-commutative ones of the DBI action for D-branes and open strings. The
Poisson structure governing the non-commutativity of the D-brane is replaced by
a Nambu structure and the open-closed string relations are generalized to the
case of p'-branes utilizing a novel Nambu sigma model description of p-branes.
In the case of an M5-brane our action interpolates between M5-actions already
proposed in the literature and matrix model like actions involving Nambu
structures.
