  The conformational properties of flexible polymers in d dimensions in
environments with extended defects are analyzed both analytically and
numerically. We consider the case, when structural defects are correlated in
\varepsilon_d dimensions and randomly distributed in the remaining
d-\varepsilon_d. Within the lattice model of self-avoiding random walks (SAW),
we apply the pruned enriched Rosenbluth method (PERM) and find the estimates
for scaling exponents and universal shape parameters of polymers in environment
with parallel rod-like defects (\varepsilon_d=1). An analytical description of
the model is developed within the des Cloizeaux direct polymer renormalization
scheme.
