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- Serotonin :
A neurotransmitter involved in mood management and associated with happiness. Often called the "happy hormone", serotonin activates or inhibits brain activity depending on the receptor to which it binds. Serotonin is essential for neurons to communicate with each other.
- Spinal canal :
A tunnel formed by the juxtaposition of the empty portion of the vertebrae, the spinal canal contains the spinal cord and nerves.
- Spinal or spinal cord :
The lower part of the central nervous system located in the vertebral column.
- Sympathetic nervous system :
A group of neurons involved in the functioning of the sympathetic nervous system, activated under alert and stress.