Sentence:  The yawning gap in neuroscientists' understanding of their topic is in the intermediate scale of the brain's anatomy. Science has a passable knowledge of how individual nerve cells, known as neurons, work. It also knows which visible <WSD>lobes</WSD> and ganglia of the brain do what. But how the neurons are organised in these <WSD>lobes</WSD> and ganglia remains obscure. 
Meaning of the word marked with <WSD> tags:  A clear division of an organ that can be determined at the gross anatomy level, especially one of the parts of the brain, liver or lung.