Each neuron is a distinct cell separate from every other neuron. Neurons send signals along axons. A tiny gap separates the ends of axons from dendrites, the receiving ends of neurons. Human neurons have on average 10,000 synapses. In the mouse brain, every neuron made nearly all its connections with just one other neuron. (Zimmer, Carl. “Secrets of the Brain.” P 34-45, National Geographic, February 2014. Washington DC: National Geographic Society.)

Any intellectually challenging activity stimulates dendritic growth, which adds to the neural connections in the brain. (Ratey, John J., MD. A User’s Guide to the Brain. p 43. NY: Vintage Books, 2002.)

Tiny hair-like filaments that project from the neuron (the word dendrite comes from the Greek word for tree). Brain cells never actually touché physically, just reach toward each other with dendrites across a gap or synapse. (Chopra, Deepak, MD. Ageless Body, Timeless Mind. p 23-25. NY: Harmony Books, 1993.)

The brain has over 100 billion neurons, each having 10,000 or more dendrites that connect with other neuronal structures. (Newberg, Andrew, MD., and Mark Robert Waldman. Why We Believe What We Believe. p 17-18. NY: Free Press, 2006.)

Dendritic spines on neurons: One trillion synaptic compartments, or "dendritic spines," could fit into a thimble. (Cold Spring Harbor Laboratory. Scientists Reveal Details Of Brain Cell Communication: Implications For Learning & Memory. ScienceDaily. 2006.)

Dendritic spines are tiny compartments that protrude from the dendrites of neurons that “receive” inputs from most excitatory synapses in the brain. Dendritic spines grow during normal maturation of the brain but are lost or abnormal in shape in many human neurological diseases, including mental retardation and dementia. Dendritic spines are mobile (e.g., they change their number and shape in response to the brain’s experience and to electrical signaling in the brain). (Sheng, Dr. Morgan. Brain Science Institute. Dendritic Spines - Tiny Structures in the Brain for Communication and Information Storage. May 2005.)

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