Which structure serves as a protective canal containing the spinal cord?

The spinal canal is the correct answer because it is specifically designed to house and protect the spinal cord. This canal runs through the vertebral column, which is made up of individual vertebrae that stack together to form a structure that encases and safeguards the spinal cord. The spinal canal also contains cerebrospinal fluid, which provides additional cushioning and support to the spinal cord.

While the spinal column refers to the entire bony structure formed by the vertebrae, it is the spinal canal within this column that directly protects the spinal cord. The cranial cavity, on the other hand, protects the brain, and the vertebral foramen is the opening in each vertebra that, when aligned, contributes to the overall formation of the spinal canal. The focus on the spinal canal highlights its dedicated role in encasing the spinal cord, emphasizing the importance of its function in the nervous system's protection.