An atlas of the human body
Every layer
of you,explorable
Rotate the skeleton. Peel back to the muscles. Look inside at the organs. Click any structure and read what it does, what goes wrong with it, and what the evidence says you can do about it.
01Skeletal layer
206 bones, 33 vertebrae, one frame
The frame everything else hangs from. Bone is living tissue — it remodels continuously in response to the loads you put through it, which is why the skeleton is one of the few organ systems you can directly train.
13labelled structures
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02Muscular layer
The engine, and the thing you can change fastest
Skeletal muscle is the most adaptable tissue you own. It responds to load within days, and the strength you build in it protects the joints underneath — which is why almost every rehabilitation programme on this site ends in a strengthening exercise.
17labelled structures
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03Organs layer
The systems doing the work right now
Everything the frame protects and the muscles serve. These organs are not independent units — the liver talks to the pancreas, the gut talks to the brain, and the kidneys quietly set your blood pressure while you read this.
16labelled structures
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3D geometry derived from BodyParts3D, © The Database Center for Life Science, licensed under CC Attribution-ShareAlike 2.1 Japan. Meshes have been grouped, simplified and recoloured for the web. These models are a teaching aid, not a diagnostic tool — anatomy varies between individuals.
For dental & medical students
The anatomy your viva actually asks about.
Every guide on this site has a subscriber layer written for university-level revision — relations, blood supply, innervation, embryology, histology and the clinical correlations that follow from them. Then a question bank generated from that same material, and a new set waiting every morning.
- Study modules
- 10Study modules
- Questions
- 1,275Questions
- Curriculum topics
- 19Curriculum topics
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From the mouth & teeth module
“A patient has anaesthesia of the lower lip and chin but normal tongue sensation. Where is the lesion?”
Distal to the origin of the lingual nerve, involving the inferior alveolar nerve or its mental branch. The lingual nerve leaves V3 above the mandibular foramen, so a lesion within the mandibular canal or at the mental foramen spares the tongue.
One of hundreds of viva questions, each linked to the paragraph that explains it.
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Nothing explored yet.Once you visit a body part, it’ll show up here for quick return trips. In the meantime — A single night of short sleep can measurably reduce immune activity the next day.
From the evidence
Regular aerobic activity lowers cardiovascular risk.
American Heart Association · 2024
Excess sodium intake raises blood pressure.
World Health Organization · 2023
Hepatitis vaccination reduces the risk of chronic liver disease.
World Health Organization · 2023
Featured deep dives
Browse all body parts →Heart
A fist-sized muscle that beats roughly 100,000 times a day to keep every cell in your body supplied.
~300g in adults
Weight
~100,000
Beats per day
~7,500 litres
Blood pumped daily
4
Chambers
Liver
The body's largest internal organ, quietly running more than 500 distinct chemical processes at once.
~1.5kg in adults
Weight
500+
Known functions
Sleep
A nightly, brain-orchestrated process that repairs, sorts and resets nearly every system in the body.
7–9 hours (adults)
Recommended duration
~90 minutes
Sleep cycle length
Brain
A three-pound command centre that runs every thought, movement and involuntary process at once.
~1.4kg in adults
Weight
~86 billion
Neurons
Lungs
A pair of spongy organs that exchange oxygen for carbon dioxide roughly 20,000 times a day.
~20,000
Breaths per day
~70 m²
Internal surface area
Skin
The body's largest organ — a living barrier that protects, senses and regulates temperature all at once.
~1.8 m² in adults
Surface area
~4kg (heaviest organ)
Weight
What are you optimising for?
Nothing works alone
Every part of the body quietly shapes several others.
The heart and kidneys continuously regulate each other's fluid balance and blood pressure.
The autonomic nervous system adjusts heart rate second-to-second based on stress, breathing and posture.
Poor sleep raises next-day resting heart rate and blood pressure, adding cumulative cardiovascular strain.
Regular training increases the heart's stroke volume, letting it pump more blood per beat at rest.
The liver supplies glucose that fuels muscle activity, especially during longer exercise.