From Thought to Movement · Muscles
One neuron plus every fibre it controls — the real unit of movement.
A motor neuron doesn't command one fibre. It branches and commands a whole set of them, and they all fire together, always. That neuron plus its fibres is a motor unit — the smallest thing your nervous system can actually switch on.
There's more: one neuron plus every fibre it controls — the real unit of movement. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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