Answer:
The anterior root of a thoracic spinal nerve would contain motor fibers (efferent fibers) that originate from the anterior horn cells of the spinal cord. These fibers carry signals from the central nervous system to the muscles, allowing for voluntary movement and control. The anterior root of the spinal nerve is typically larger than the posterior root, which contains sensory fibers (afferent fibers) that carry signals from the body's periphery to the central nervous system. Together, the anterior and posterior roots merge to form a spinal nerve, which then branches off to innervate specific regions of the body.
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