Term Name:	substantia nigra
Synonyms:	nucleus of basis pedunculi, nucleus pigmentosus subthalamo-peduncularis, SN, Soemmering's substance, substancia nigra, substantia nigra (Soemmerringi)
Definition:	Predominantly gray matter midbrain structure lying dorsal to the crus cerebri and ventral to the midbrain tegmentum. It is divided into a dorsal, cellularly compact region known as the pars compacta and a more ventrally located, containing more loosely packed cells, the pars reticulata. The most lateral region of the reticulata is identified as the pars lateralis (MM).
Ontology:	Cell Ontology [UBERON:0002038]