The funnel represents the confluent nature of the discussed mechanisms, that alone or in combination may trigger Pb2+ neurotoxicity. See the text for details on amelioration strategies and on key players participating in each mechanism (depicted on both sides of the figure). ROS, reactive oxygen species; RNS, reactive nitrogen species; mitoROS, mitochondrial-generated ROS; Ca2+, calcium; Zn2+, zinc; Fe2+, iron; BBB, blood-brain barrier; BCB, blood-cerebrospinal fluid barrier.