Body
Every region, organised by system
Start from the 3D body explorer, browse the anatomical regions by system below, or jump straight to any of the 53 deep-dive guides.
The heart, blood vessels and blood that keep every cell supplied and connected.
The airway and lungs that exchange oxygen for carbon dioxide roughly 20,000 times a day.
A 9-metre tube — plus the liver and pancreas — that turns food into fuel.
The brain, spinal cord and nerve network that command every voluntary and involuntary action.
The hormone system that quietly regulates growth, metabolism, mood and reproduction.
A quiet drainage network that clears fluid, filters waste and supports immunity.
The 206-bone framework that protects organs, stores minerals and enables movement.
Over 600 muscles that generate every movement, from a heartbeat to a sprint.
The kidneys and bladder that filter blood and balance fluid, salts and pH.
The hormonal and physical systems governing fertility and sexual health.
Skin, hair and nails — the body's largest organ and its first line of defence.
The continuous connective web that wraps every muscle, organ and nerve.
Eyes, ears and the other senses that connect you to the world.
All 53 deep-dive guides
Every guide covers anatomy, function, lifestyle levers, conditions, optimisation and evidence — including organs and tissues that have no single hotspot on the body map.
Legs
Achilles Tendon & Ankles
The strongest tendon in the body — a biological spring that returns much of the energy of every stride.
Upper abdomen
Adrenal Glands
Two small caps on top of your kidneys that produce the hormones of stress, salt balance and survival.
Upper body
Arms & Elbows
A hinge with a rotational twist — the linkage that turns shoulder power into hand precision.
Pelvis
Bladder
A stretchy, muscular reservoir that stores urine until it's convenient to release it.
Whole body
Blood
Five litres of living tissue that carries oxygen, delivers immunity, seals wounds and reports on the state of every organ.
Whole body
Blood Vessels
Around 100,000 km of arteries, veins and capillaries whose inner lining is an active organ in its own right.
Whole body
Bones
Living, remodelling tissue that is also your calcium bank, your blood cell factory and an endocrine organ.
Head
Brain
A three-pound command centre that runs every thought, movement and involuntary process at once.
Chest
Breasts
Modified sweat glands that remodel with every cycle, pregnancy and decade — and where knowing your own normal matters most.
Legs
Calves
The spring that propels every step and the second pump that helps return blood to your heart.
Chest
Chest & Pectorals
The pushing muscles of the upper body, wrapped around a rib cage that has to move with every breath.
Abdomen
Core & Abdominal Muscles
A pressurised cylinder of muscle that stabilises the spine, manages abdominal pressure and transfers force between limbs.
Chest
Diaphragm
The dome of muscle that does most of your breathing, holds back reflux and helps stabilise your spine.
Head
Ears
A pair of organs that handle both hearing and balance, using the same intricate inner-ear machinery.
Face
Eyes
A pair of optical organs that convert light into the electrical signals your brain reads as sight.
Whole body
Fascia & Connective Tissue
A continuous collagen web wrapping every muscle, organ and nerve — richly innervated, and only recently taken seriously.
Legs
Feet & Ankles
26 bones and over 100 muscles, tendons and ligaments per foot, absorbing every step you'll ever take.
Upper right abdomen
Gallbladder
A small muscular reservoir under the liver that concentrates bile and delivers it on demand for fat digestion.
Pelvis
Glutes
Three muscles that made humans upright runners — the body's largest muscle group and its most under-trained stabiliser.
Legs
Hamstrings
Three muscles spanning two joints — the most commonly strained muscle group in sport, and the most preventable.
Upper body
Hands & Wrists
Twenty-seven bones per hand, an opposable thumb, and a grip strength that predicts how long you'll live.
Chest
Heart
A fist-sized muscle that beats roughly 100,000 times a day to keep every cell in your body supplied.
Pelvis
Hips & Pelvis
The deepest, most stable joint in the body and the structural hub where the spine, legs and trunk meet.
Whole body
Immune & Lymphatic System
A distributed defence network — spread through blood, tissue and roughly 600 lymph nodes — that detects and neutralises threats.
Whole body
Joints
Around 350 articulations with a cartilage surface more slippery than ice and no blood supply to repair itself.
Lower back
Kidneys
A pair of fist-sized filters that clean your entire blood volume roughly 40 times a day.
Legs
Knees
The body's largest joint — a hinge built for enormous load, and one of the most commonly injured.
Lower abdomen
Large Intestine & Gut Microbiome
A metre-and-a-half tube that hosts trillions of microbes shaping digestion, immunity and mood.
Upper right abdomen
Liver
The body's largest internal organ, quietly running more than 500 distinct chemical processes at once.
Lower back
Lower Back
Five vertebrae that carry your entire upper body — and the single largest cause of disability worldwide.
Chest
Lungs
A pair of spongy organs that exchange oxygen for carbon dioxide roughly 20,000 times a day.
Face
Mouth & Teeth
Where digestion begins and where enamel, the body's hardest tissue, takes on a lifetime of load.
Head
Neck & Cervical Spine
Seven small vertebrae that carry the weight of your head, protect the spinal cord, and give your gaze its range.
Whole body
Nerves & Peripheral Nervous System
Tens of thousands of kilometres of wiring carrying signals at up to 120 metres per second — and the only nerves that can regrow.
Face
Nose & Sinuses
Air conditioning, filtration and odour detection, all handled before a single breath reaches the lungs.
Chest
Oesophagus
A muscular tube that actively pushes food to your stomach and holds back acid with a valve you cannot feel.
Upper abdomen
Pancreas
A rare dual-role organ — part hormone gland, part digestive enzyme factory.
Head
Pituitary Gland
A pea-sized gland beneath the brain that directs the thyroid, adrenals, gonads, growth and water balance.
Pelvis
Prostate
A walnut-sized gland wrapped around the urethra that produces most of semen — and enlarges in most men with age.
Legs
Quadriceps & Thighs
The largest muscle group in the body, and the one whose strength most reliably predicts independence in later life.
Pelvis
Reproductive System
The hormonal and physical systems governing fertility, with effects that reach far beyond reproduction.
Head
Scalp & Hair
Roughly 100,000 individually cycling follicles, each running on its own independent growth clock.
Upper body
Shoulders
The body's most mobile joint — a trade-off between extraordinary range of motion and inherent instability.
Whole body
Skin
The body's largest organ — a living barrier that protects, senses and regulates temperature all at once.
Whole body, orchestrated by the brain
Sleep
A nightly, brain-orchestrated process that repairs, sorts and resets nearly every system in the body.
Abdomen
Small Intestine
A six-metre tube, folded into a fraction of its length, where most nutrient absorption happens.
Back
Spine
A stack of 33 bones that protects the spinal cord while giving the body its structure and flexibility.
Upper abdomen
Spleen
A blood filter and immune outpost tucked under your left ribs — quality control for red cells and first defence against encapsulated bacteria.
Upper abdomen
Stomach
A muscular, acid-filled pouch that breaks food down before handing it off to the intestines.
Head
Throat & Voice
A shared corridor for air, food and speech — and the site of one of the body's most precise reflexes.
Neck
Thyroid
A butterfly-shaped gland in your neck that sets the metabolic tempo of every cell you own.
Back
Upper Back
The thoracic spine and the muscular sheet across it — the most neglected region in modern posture, and the one that unlocks the shoulders.
Whole body
Vagus Nerve
The wandering nerve linking brain to heart, lungs and gut — and mostly carrying information the other way.