Individual Human neurons can have over 4 meters of motile dendrites (they are more like amoeba pseudopods than tree branches), with over 2 million mitochondria

Individual Human neurons can have over 4 meters of motile dendrites (they are more like amoeba pseudopods than tree branches), with over 2 million mitochondria getting transported around each cell, and connect to over 10,000 other neurons. That's a big social network! Neurons are incredibly complicated organisms. Most of our DNA codes for neural genes -- and neurons (and skin) are the default cell type (if an embryonic stem cell isn't turned into something else). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5687842/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5687842/