  We present molecular dynamics simulations of the motion of a single rigid rod
in a disordered static 2d-array of disk-like obstacles. Two different
configurations have been used for the latter: A completely random one, and
which thus has an inhomogeneous structure, and an homogeneous ``glassy'' one,
obtained from freezing a liquid of soft disks in equilibrium. Small differences
are observed between both structures for the translational dynamics of the rod
center-of-mass. In contrast to this, the rotational dynamics in the glassy host
medium is strongly slowed down in comparison with the random one. We calculate
angular correlation functions for a wide range of rod length $L$ and density of
obstacles $\rho$ as control parameters. A two-step decay is observed for large
values of $L$ and $\rho$, in analogy with supercooled liquids at temperature
close to the glass transition. In agreement with the prediction of the Mode
Coupling Theory, a time-length and time-density scaling is obtained. In order
to get insight on the relation between the heterogeneity of the dynamics and
the structure of the host medium, we determine the deviations from Gaussianity
at different length scales. Strong deviations are obtained even at spatial
scales much larger than the rod length. The magnitude of these deviations is
independent of the nature of the host medium. This result suggests that the
large scale translational dynamics of the rod is affected only weakly by the
presence of inhomogeneities in the host medium.
