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The human body, from the outside in
Peel the body from the skin to the skeleton, read how each of its systems works, and follow a new life from a sperm cell to its first breath. Every page here opens into the 3D.
Open the atlas Take a tour of the body
- named parts
- 3,400+
- layers
- 7
- systems
- 15
- chapters
- 13
The body, system by system
What each system does, its main organs and their real numbers, and a way to see each one in the atlas.
The heart and blood vessels
The heart is a muscular pump with four chambers. Its valves direct blood forward through the pulmonary and systemic circuits.
Read the lungs · the trachea · the larynx · the diaphragmThe lungs and airways
The airways conduct air to the lungs, where oxygen and carbon dioxide move between air and blood.
Read the tongue · the oesophagus · the stomach · the liverThe digestive system
The digestive tract breaks down food, absorbs nutrients and water, and moves waste onward.
Read the kidneys · the bladderThe kidneys and the urinary system
The kidneys filter blood and regulate fluid, electrolyte, and acid–base balance.
Read the brain · the spinal cord · the eyeThe brain and the nervous system
The brain, spinal cord, and peripheral nerves carry and process signals.
ReadThe journey to life, chapter by chapter
From the vagina to birth: what happens at each step, with the numbers behind it.