  A schematic model for hadronic states, based on constituent quarks and
antiquarks and gluon pairs, is discussed. The phenomenological interaction
between quarks and gluons is QCD motivated. The obtained hadronic spectrum
leads to the identification of nucleon and $\Delta$ resonances and to
pentaquark and heptaquark states. The predicted lowest pentaquark state
($J^{\pi} = {1/2}^-$) lies at the energy of 1.5 GeV and it is associated to the
observed $\Theta^+(1540)$ state. For heptaquarks ($J^{\pi} = {1/2}^+, {3/2}^+$)
the model predicts the lowest state at 2.5 GeV.

Nuclear Theory