Pain, Drawing

Pain, Drawing

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Credit: Jacopin / BSIP/SCIENCE PHOTO LIBRARY

Caption: The path of the pain and its inhibition at the level of the neurons of the spinal cord. The red arrow indicates the path of the pain that directs towards the brain. The blue arrow indicates the path of pain inhibition thanks to the secretion by the hypothalamus and pituitary gland of endorphin. The presynaptic neuron releases the neurotransmitters of the pain via synaptic vesicles. These neurotransmitters are released in the synaptic cleft and fixes on the receptors of the synapse of the postsynaptic neuron. To fight against the pain the neuron of the inhibition will secrete endorphin (neurotransmitters represented by the blue balls). The endorphin fixes on the membrane receptors of the postsynaptic neuron instead of the neurotransmitters of the pain.

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