Brain cells, or neurons, communicate using a combination of electrical and chemical signals. An electrical signal (action potential) travels down a neuron’s axon, and at the end of the axon, it triggers the release of chemical messengers called neurotransmitters into a tiny gap called a synapse. These neurotransmitters then bind to receptors on the next neuron, which translates the chemical signal back into an electrical signal, continuing the message. Mitochondria are critical for fueling and r

Brachial plexus injury - Symptoms and causes