Every bone, organ, muscle, vessel and nerve of a real adult body, in your browser. Spread it apart, open the heart or the brain, follow a guided tour, then test yourself on what you just saw.
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Anatomy: BodyParts3D © DBCLS and the Human Reference Atlas (HuBMAP), both CC BY 4.0. Full credits
A textbook plate shows one angle with the labels already filled in. Here you choose the angle, the layer and the level of detail, and the labels come off when you want to test yourself.
One slider spreads every structure out in layers, then lays them flat on a specimen table grouped by system.
Ten organs open into close-ups with callout labels on every sub-structure, and each one comes apart on its own.
Remove skin, muscle, vessels and organs one layer at a time, or turn any system to glass to see what sits behind it.
Follow blood through the heart, a meal through the gut or light through the eye, one structure at a time.
Find a named structure on the model or name a highlighted one. Rounds are built from whatever you have on screen.
Every structure comes from open research datasets, with its real size on the model and the system it belongs to.
Open an organ from the atlas to see it alone, labelled structure by structure, and spread it apart to look inside. These are the facts each guide covers.
A four-chambered muscular pump. The right side pushes blood through the lungs, the left side through the rest of the body.
The control centre of the nervous system: it interprets the senses, starts movement, stores memory and keeps breathing, heart rate and temperature in check.
Two spongy organs that fill most of the chest. Air reaches some 300–500 million alveoli, where oxygen and carbon dioxide cross a barrier thinner than a cell.
The largest internal organ and the body's chemical plant: it processes absorbed nutrients, stores glycogen, builds plasma proteins, clears drugs and toxins and makes bile.
A muscular J-shaped bag between the oesophagus and the duodenum. It stores a meal, churns it with acid and pepsin, and releases it a little at a time.
Two bean-shaped filters against the back wall of the abdomen. Together they receive about a fifth of every heartbeat and turn it into urine.
A soft gland lying across the back of the abdomen. Most of it makes digestive enzymes; scattered islets make insulin and glucagon.
Six metres of coiled tube where nearly all digestion finishes and nutrients are absorbed: duodenum, jejunum, then ileum.
The final 1.5 m of the gut. It frames the small intestine, absorbs water and salts, hosts trillions of bacteria and stores faeces until they leave.
A 24 mm sphere that focuses light onto the retina. The cornea does most of the bending, the lens fine-tunes it and the retina turns it into nerve signals.
The male reference body, counted by system. Switch any of them on, off or to glass from the Systems tab.
Skin & body surface · 5 structures
The skin is the body's largest organ. It is a waterproof barrier against microbes and UV light, holds the receptors for touch, pain and temperature, and regulates heat through sweat and blood flow.
Muscles · 424 structures
Skeletal muscles move the body by pulling on bone through their tendons. They work in opposing pairs, hold posture against gravity and produce most of the body's heat.
Arteries · 639 structures
Arteries carry blood away from the heart. Their thick, elastic and muscular walls absorb each heartbeat's pressure surge and keep blood moving between beats.
Veins · 404 structures
Veins return blood to the heart. Their walls are thinner than arteries' and the larger ones in the limbs have valves, so contracting muscles squeeze blood back towards the heart.
Nervous system · 146 structures
The brain and spinal cord process information; peripheral nerves carry signals to and from every part of the body. Together they control movement, sensation and the automatic regulation of the organs.
Heart · 18 structures
The heart is a four-chambered muscular pump. Its right side sends blood to the lungs, its left side to the rest of the body, and four valves keep the flow moving in one direction.
Respiratory · 105 structures
The airways conduct air from the nose and mouth down to the lungs, where oxygen crosses into the blood and carbon dioxide leaves it.
Digestive · 99 structures
The digestive tract breaks food down mechanically and chemically, absorbs nutrients and water, and eliminates waste. The liver, gallbladder and pancreas add bile and enzymes.
Urinary · 6 structures
The kidneys filter the blood and make urine, which the ureters carry to the bladder for storage. They also control blood pressure, salt and water balance and acid–base balance.
Reproductive · 12 structures
The reproductive organs produce gametes and sex hormones and, in the female body, support pregnancy.
Endocrine · 4 structures
Endocrine glands release hormones into the blood that regulate metabolism, growth, stress responses, blood sugar and reproduction.
Lymphatic · 3 structures
Lymphatic vessels return excess tissue fluid to the blood. Lymph nodes, the spleen and the thymus filter it and host the immune cells that respond to infection.
Sense organs · 39 structures
The eyes, ears and their supporting structures turn light, sound and head movement into nerve signals the brain can interpret.
Cartilage & ligaments · 44 structures
Cartilage and ligaments connect and cushion the skeleton. Cartilage covers joint surfaces and shapes the nose, ears and ribcage; ligaments tie bone to bone.
Skeleton · 286 structures
The skeleton supports and protects the body, gives muscles their levers, stores calcium and phosphate, and its marrow makes blood cells. An adult has 206 bones.
Start from a region or an organ, not the whole body. Click each structure and read what it does and what it is part of. Spread it apart to see what sits behind what.
Anatomy sticks when it tells a story. The 5 guided tours walk the routes exams ask about: blood through the heart, food through the gut, air into the lungs, light through the eye and urine out of the body.
Switch on Test yourself. Finding a structure on a 3D model you can rotate is harder, and more like a practical exam, than picking a word from a list. Everything you miss comes back in a review list.
Yes. It runs in your browser with no account, no download and no paywall. Use it for your own revision or project it in a classroom.
The male body is BodyParts3D 4.0 from Japan's Database Center for Life Science, built from MRI data and checked against anatomical illustration. The female body is the Human Reference Atlas from the HuBMAP consortium, built on the U.S. National Library of Medicine's Visible Human Project. Both are open CC BY 4.0 datasets used in research and teaching. Lorea compressed the geometry for the web, corrected several system assignments and wrote the descriptions, organ guides, tours and quizzes.
It is an exploded view. The first half of the slider pulls the body apart in layers, skin furthest and bone least, so you can see how structures nest inside each other. The second half lays every visible structure out flat on a specimen table, grouped by system, so you can count and compare them side by side.
Use it in three passes. Explore a region or organ and read what each part does. Run a guided tour to put the parts in order, such as the path of blood through the heart. Then switch on Test yourself: you either find a named structure on the model or name a highlighted one. Retrieval, not looking, is what moves anatomy into long-term memory.
The two bodies come from different research projects. The female source is far more detailed in places (its brain is split into 283 regions and its kidneys into 87), but it does not model the skull, ribs, arm or foot bones. Those are fitted from the male reference so the skeleton reads as a whole, and they are labelled as fitted wherever they appear.
Yes, on any recent phone or tablet with WebGL. The skeleton and organs load first (about 3 MB on the male body) and muscles, vessels and nerves stream in afterwards, so the body is on screen within seconds even on mobile data.
The same library zooms down to single cells, each with its own labelling quiz.
Upload a lecture PDF or slides and Lorea builds flashcards, practice questions and study games from it. Use the atlas to see it, then drill it until it sticks.
Start for freeMale body: BodyParts3D 4.0, © The Database Center for Life Science, licensed under CC BY 4.0 (Mitsuhashi et al., Nucleic Acids Research, 2009). Female body: Human Reference Atlas 3D Reference Organ Set for Female v1.10 (HuBMAP) by Kristen Browne and Heidi Schlehlein, built on the Visible Human Project of the U.S. National Library of Medicine, CC BY 4.0; female lower-limb muscles from Andreassen et al., Scientific Data (2023), CC BY 4.0. Browser packaging adapted from the MIT-licensed Human Atlas project. Lorea re-compressed the geometry (5.1 million triangles across both bodies), corrected several system assignments and wrote all descriptions, organ guides, tours and quizzes. For learning, not diagnosis.
