Our Approach · The Nervous System

61 lessons · four parts · one integrative state

The Nervous System

The complete index, built on clinical neuroscience and clinical neurochemistry, told through the Unified Model of Tone. Sixty-one lessons mapped from the single neuron and its chemistry to the whole integrated person, and the central integrative state we call tone.

This index is organized in four parts: how the nervous system is built and fueled, how it senses and moves, what the rest of the body sends it, and how it fails and recovers. The sixty-one lessons sit inside those four parts, in that order.

The full map · select any lesson to open it

I
Part One · 19 lessons

How It Is Built and Fueled

The neuron, its chemistry, its fuel, and the blueprint it was built from

The nervous system is a chemical machine before it is anything else. Roughly eighty six billion neurons hold a resting potential near minus seventy millivolts, and holding it costs about half the brain's resting energy. The brain is two percent of body mass and takes twenty percent of the oxygen and glucose. Nineteen lessons on the neuron, the neurotransmitters, the fuel, and the blueprint.

The NeuronThe neuron, the synapse, and the neurotransmitters

The FuelMitochondria, glucose, and oxygen

The BlueprintEmbryology and the development of the nervous system

II
Part Two · 25 lessons

How It Senses and Moves

Sensation and movement, from the muscle spindle to the cortex

Sensation and movement are one loop read from two ends. Ninety percent of corticospinal fibers cross in the lower medulla, and the cerebellum alone holds sixty to eighty billion granule cells. Vestibular afferents idle near one hundred hertz so the system can signal in both directions at once. Twenty five lessons, from the muscle spindle to the cortex.

The SensesProprioception, the peripheral nerves, and sensation

The PathwaysThe spinal cord and the autonomic nervous system

The HindbrainThe brainstem, the cerebellum, and the vestibular system

The ForebrainThe cerebral cortex, the basal ganglia, and the lobes

III
Part Three · 7 lessons

What the Rest of the Body Sends It

The HPA axis, the gut, the immune system, and the hormones

The brain is not sealed off from the body. Cortisol arrives in about forty pulses across a day, and eighty percent of vagal traffic runs from the viscera upward. Those inputs decide whether a nervous system runs hot, runs flat, or holds a steady tone. Seven lessons on the HPA axis, the gut, the immune system, and the hormones.

IV
Part Four · 10 lessons

How It Fails and Recovers

Stroke, pain, headache, degeneration, and the plasticity that rebuilds

Failure is informative. Neurons fall silent after sixty to ninety seconds without oxygen, eighty five percent of strokes are ischemic, and eighty percent of striatal dopamine is gone before the first sign of Parkinson disease. Recovery runs on the same machinery, which is what the neurological exam reads and what neuroplasticity rebuilds. Ten lessons on breakdown and repair.

The BreakdownStroke, pain, headache, and neurodegeneration

The ApplicationReading the system, restoring its tone

Questions About This Index

How is the nervous system section organized?

In four parts. Part one covers how the nervous system is built and fueled, from the neuron and its neurotransmitters to the mitochondria and the embryology. Part two covers how it senses and moves, from the muscle spindle to the cortex. Part three covers what the rest of the body sends it, including the HPA axis, the gut, and the immune system. Part four covers how it fails and recovers, from stroke and chronic pain to the neurological exam and neuroplasticity.

Where should I start reading?

Start with lesson one, The Neuron and the Integrative State, which sets up the idea the rest of the index rests on. If you came for one system, go straight to the part that holds it. Sensation and movement sit in part two. The gut, immune, and hormonal inputs sit in part three. Pain, headache, stroke, and rehabilitation sit in part four.