Central Nervous System

The central nervous system (CNS) is the part of the nervous system consisting of the brain and spinal cord, where information is processed and coordinated.

The CNS receives sensory information from the body, interprets it, and generates appropriate responses. It is responsible for conscious thought, memory, learning, movement, and many automatic functions essential for survival. The peripheral nervous system connects the CNS to the rest of the body.

QUICK FACT

Although the brain accounts for only about 2% of body weight, it consumes roughly 20% of the body’s oxygen and energy at rest.

COMMONLY CONFUSED WITH

Peripheral Nervous System: The central nervous system consists only of the brain and spinal cord, while the peripheral nervous system includes all nerves outside these structures.

SEE ALSO

Clinical & Educational Context

Discussed in Health Articles & Guides

Explore how "Central Nervous System" is covered across our evidence-based editorial guides:

1 Article
The Hard Parts of Medicine

Polypharmacy: What Really Happens When You Take Multiple Medicines

Combining opioids with certain sedatives or other central nervous system depressants can increase the risk of profound sedation, overdose, and breathing difficulties.