Referring to the efferent connection of the substantia nigra with the striatum. See substantia nigra.
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ni·gro·stri·a·tal .nī-grō-strī-'āt-əl adj of, relating to, or joining the corpus striatum and the substantia nigra <the \nigrostriatal dopamine pathway degenerates in Parkinson's disease (S. H. Snyder )(et al)>
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ni·gro·stri·a·tal (ni″gro-stri-aґtəl) projecting from the substantia nigra to the corpus striatum; said of a bundle of nerve fibers.Medical dictionary. 2011.