A filamentous, cage-like assembly on the nuclear face of the nuclear pore complex (NPC). In S. cerevisiae, Mlp1p and Mlp2p are two major components of the NPC nuclear basket. In vertebrates, Tpr is a major component. [ http://www.ncbi.nlm.nih.gov/pubmed/19524430 http://www.ncbi.nlm.nih.gov/pubmed/22419078 http://www.ncbi.nlm.nih.gov/pubmed/20947011 http://www.ncbi.nlm.nih.gov/pubmed/18046406 ]