Muscles receive their instructions from nerves. Signals from the brain travel down the spinal cord, and then go out to the muscles along nerves. Nerves branch out so they reach each part of the muscle. The signals tell the muscles to contract, and the body moves.
Nerves and muscles, working together as the neuromuscular system, make your body move as you want it to. They also make sure you do things you don’t even think about, such as breathe.
Nerves have cells called neurons. Neurons carry messages from the brain via the spinal cord. The neurons that carry these messages to the muscles are called motor neurons.
Each motor neuron ending sits very close to a muscle fibre. Where they sit together is called a neuromuscular junction. The motor neurons can release a chemical, which is picked up by the muscle fibre. This tells the muscle fibre to contract, which makes the muscles move.
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