Spinal nerve
Spinal Nerve
A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human body, there are 31 pairs of spinal nerves, one on each side of the vertebral column. These are grouped into the corresponding cervical, thoracic, lumbar, sacral and coccyx regions of the spine.
Pronunciation
Spinal Nerve: /ˈspaɪnəl ˈnɜːrv/
Etymology
The term "spinal nerve" is derived from the Latin words "spina" meaning "thorn" or "backbone," and "nervus" meaning "nerve."
Structure
Each spinal nerve is a mixed nerve that is formed from the combination of nerve fibers from its posterior and anterior roots. The posterior root is the sensory root that carries sensory information to the brain from the rest of the body. The anterior root is the motor root that carries motor instructions from the brain to the rest of the body.
Function
Spinal nerves have a crucial role in transmitting signals between the spinal cord and the rest of the body. They carry motor information to the muscles and glands, and sensory information to the spinal cord from the body.
Related Terms
- Spinal Cord: The long, thin, tubular structure made up of nervous tissue, which extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column.
- Nerve Root: The initial segment of a nerve leaving the central nervous system.
- Motor Neuron: A neuron whose cell body is located in the motor cortex, brainstem or the spinal cord, and whose axon projects to the spinal cord or outside of the spinal cord to directly or indirectly control muscles.
- Sensory Neuron: Neurons responsible for converting external stimuli from the organism's environment into internal electrical impulses.
External links
- Medical encyclopedia article on Spinal nerve
- Wikipedia's article - Spinal nerve
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