3 million synapses in a grain of sand
“I’ve made this video as an intuition pump for the density of synapses in the brain. This volume ~ grain of sand, has >3.2 million synapses (orange cubes). Peeling them away leaves only inputs on 2 neurons. Zooming in, we see the synapses localized to the dendritic spines.” Tyler Sloan, data scientist and data vizualisation specialist. His LinkedIn here.
Video by Tyler Sloan [video speed edited].