Assertion: hypothalamus's neuron | /r/HasProperty | packed the pars compacta
Facets:
value: densely
type: DEGREE
Source sentences:
text: There are two regions within the substantia nigra – one where neurons are densely packed (the pars compacta) and one where they aren't (the pars reticulata), which serve a different role from one another within the basal ganglia system.