part of part of Homo sapiens basal ganglion http://upload.wikimedia.org/wikipedia/commons/1/1b/Basal_Ganglia_and_Related_Structures.svg nuclei basales FMA:62514 CALOHA:TS-1149 DHBA:10332 it is necessary to introduce two classes, one representing an individual basal ganglion, another representing the aggregate structure, in order to have consistent classification amongst AOs (e.g. in MA the aygdala is part of the BG, in FMA and BTO it is a subclass). Apart from achieving this consistency, the value of having two distinct classes is questionable, since the BG-plural is trivially the set of all BGs-singular. it would be better for all AOs to decide on one single way of doing this. Do not merge until this is done. EFO:0000904 An individual member of a collection of basal ganglia. Basal ganglia are subcortical masses of gray matter in the forebrain and midbrain that are richly interconnected and so viewed as a functional system. The nuclei usually included are the caudate nucleus (caudoputamen in rodents), putamen, globus pallidus, substantia nigra (pars compacta and pars reticulata) and the subthalamic nucleus. Some also include the nucleus accumbens and ventral pallidum[NIF,modified]. basal ganglion BTO:0000235 SCTID:244434001 UBERON:0002420 basal nucleus basal ganglia basal ganglion of telencephalon brain gray matter nuclear complex of neuraxis collection of basal ganglia