  Quark and lepton masses and mixings are considered in the framework of the
microscopic model. The most general ansatz for the interactions among tetrons
leads to a Hamiltonian $H_T$ involving Dzyaloshinskii-Moriya (DM), Heisenberg
and torsional isospin forces. Diagonalization of the Hamiltonian provides for
24 eigenvalues which are identified as the quark and lepton masses. While the
masses of the third and second family arise from DM and Heisenberg type of
isospin interactions, light family masses are related to torsional interactions
among tetrons. Neutrino masses turn out to be special in that they are given in
terms of tiny isospin non-conserving DM, Heisenberg and torsional couplings.
The approach not only leads to masses, but also allows to calculate the quark
and lepton eigenstates, an issue, which is important for the determination of
the CKM and PMNS mixing matrices. Compact expressions for the eigenfunctions of
$H_T$ are given. The almost exact isospin conservation of the system dictates
the form of the lepton states and makes them independent of all the couplings
in $H_T$. Much in contrast, there is a strong dependence of the quark states on
the coupling strengths, and a promising hierarchy between the quark families
shows up.
