Brain Anatomy
Roughly 86 billion neurons, three pounds of tissue, and the seat of everything you think and feel. A map of the brain's…
4.6
Read guide
Anatomy Category
Brain & Nervous System
Your body's control centre and its lightning-fast wiring — the brain, spinal cord, nerves, reflexes and how you feel pain.
Guides
Guides in Brain & Nervous System
Start with any guide below — each one is written for beginners and builds on the last.
The Nervous System
Your body's high-speed messaging network. How neurons fire, how the central and peripheral systems divide the work, and…
4.9
Read guide
Human Reflexes
Why your hand pulls back before you feel the heat. Reflex arcs, the spinal shortcut, and how automatic responses…
4.6
Read guide
Pain Explained
Pain is not damage — it is a signal the brain builds. How nociceptors, nerves and the brain work together to protect…
4.6
Read guide
Practice
Related tools
Reinforce what you learn with these interactive tools.
Interactive
Body Systems Explorer
Browse all major body systems in one place and jump to the organs and guides for each.
4.6
Open tool
Quiz
Anatomy Quiz
Test your knowledge of the human body with an adaptive multiple-choice quiz and instant, explained feedback.
4.9
Open tool
Reference
Anatomy Glossary
A searchable, plain-language glossary of the anatomy terms used across the site.
4.8
Open tool
Read more
Related articles
Deeper dives and fascinating facts from the blog.
Brain Myths, Debunked: What Science Actually Says
The 10% brain myth, "left-brained" personalities, and more. We separate durable neuroscience myths from the evidence.
Understanding Human Reflexes: Faster Than Thought
Touch something hot and your hand moves before you feel it. The reflex arc, explained — and why it exists.
The Science of Pain: How the Body Sends Warnings
Pain is not damage — it is a protective signal the brain builds. A beginner-friendly look at how pain really works.
Explore another body system
Every part of the body connects to the rest. Browse all nine categories and keep exploring.