There are relatively few spindle cells: only about 80,000, with approximately 45,000 in the right hemisphere and 35,000 in the left. This disparity is at least one reason for the perception that emotional intelligence is the province of the right brain, although the disproportion is modest. Gorillas have about 16,000 of these cells, bonobos about 2,100, and chimpanzees about 1,800. Other mammals lack them completely.
