  {}From the study of the multiple muon events in deep underground detectors,
it is possible to extract information about the spectrum and composition of the
primary cosmic rays. In this work the number of TeV muons produced by a primary
cosmic ray of a given energy and zenith angle is computed using analytic and
montecarlo methods, for a family of simplified models as description of the
properties of hadronic interactions. The effects of the uncertainties in our
knowledge of the hadronic cross sections in the calculation of TeV muons are
discussed.
