The chiral dynamics of QCD and the spins inside the nucleon

It is demonstrated that in the theory of quantum chromodynamics the axial baryonic charge of the nucleon is expected to be close to zero as a consequence of the QCD anomaly and the spontaneous breaking of the chiral symmetry. The consequences for the spin density moments are discussed. The quarks contribute essentially nothing to the spon of the nucleon as a consequence of the QCD anomaly and the constraints imposed by the chiral symmetry. The emerging physical picture of the spin densities is in excellent agreement with the experimental results obtained in the polarized lepton-nucleon scattering experiments. (orig.)