Final answer:
Specific regions of the body associated with a specific pair of spinal nerves are called C. dermatomes, which are distinct from plexuses, ganglia, and tracts.
Step-by-step explanation:
Specific regions of the body associated with a specific pair of spinal nerves are called C. dermatomes. Dermatomes are the surface areas of the skin innervated by the sensory fibers of a single spinal nerve root.
The human body can be mapped into these regions, allowing for the identification of areas affected by specific nerve damage.
On the other hand, a plexus is a network of nerve fibers with no associated cell bodies, a ganglion is a collection of neuron cell bodies in the Peripheral Nervous System (PNS), and a tract is a bundle of axons in the Central Nervous System (CNS).
When considering the Peripheral Nervous System, if we are specifically talking about a bundle of axons, these are referred to as nerves.