What does the central nervous system (CNS) primarily consist of?

The central nervous system (CNS) primarily consists of the brain and spinal cord. The CNS is responsible for processing and transmitting information throughout the body, and these two structures are essential components of that system. The brain acts as the control center, integrating sensory information, coordinating responses, and overseeing cognitive processes. The spinal cord serves as the main conduit for information traveling between the brain and the rest of the body.

In contrast, peripheral nerves, blood vessels, and lymphatic systems pertain more to other anatomical classifications. Peripheral nerves are part of the peripheral nervous system, which connects the CNS to limbs and organs but does not constitute the CNS. Blood vessels are part of the circulatory system, and the lymphatic system is unrelated to the structure and function of the CNS. Thus, the option identifying the brain and spinal cord captures the correct focus on what comprises the central nervous system.