**Core Concept**
The human spinal cord is a long, thin, tube-like structure made up of nervous tissue, extending from the base of the brain down to the lower back. It is enclosed within the spinal canal, which is formed by the vertebrae. The spinal nerves arise from the spinal cord and emerge through spaces between the vertebrae.

**Why the Correct Answer is Right**
There are 31 pairs of spinal nerves that arise from the spinal cord, which are divided into five regions: cervical, thoracic, lumbar, sacrum, and coccyx. Each region has a specific number of nerve pairs, with 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal pair.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it underestimates the total number of spinal nerve pairs.
**Option B:** This option is also incorrect as it does not accurately represent the total number of spinal nerve pairs.
**Option D:** Similarly, this option is incorrect as it overestimates the number of spinal nerve pairs.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the number of spinal nerve pairs is 31 in total for the entire spinal column, which can be a critical piece of information in neurology and orthopedics.

**Correct Answer:** C. 31 pairs of spinal nerves