BodyParts3D
Whole-body anatomy, including organs
Database Center for Life ScienceMade possible by open-source anatomy.
Explore anatomy.All for free.
Anatomy data shared by researchers, brought closer to everyday learning. The JINTAI 3D series uses open-source anatomy models. JINTAI 3D Model, Challenge, Book and NeuroMap are all free to use. Rotate, separate and discover how the body connects.
Open JINTAI 3D Model for freeNeuroMap is now availableNo sign-up, payment or installation. Just your browser.
Drag or use the arrow keys to rotate the anatomical model. On a phone, swipe horizontally to rotate.Loading the 3D specimenDrag to rotate
Try the interactive modelBeyond knowing the names.See where things are.Discover how they connect.
The overlap of muscles. Their position around a bone. Things a single illustration can make hard to see. Change your perspective and explore at your own pace. The JINTAI 3D series is made for those small discoveries.
One human body.So much to discover.
Switch between the views below and discover anatomy in three dimensions.
Look beyond the overlap.
Separate bones and muscles into individual structures. Open up their overlapping layers and connect the whole body with its parts.
The exploded view moves structures from their anatomical positions to make them easier to see.
Open JINTAI 3D Model for freeActual BodyParts3D data
Beneath the muscles.A world within.
Organs sheltered by bone. Structures woven together. Explore the inside of the body from your own perspective.
Open the whole-body viewer
Get closer to the organs that interest you.
A view beneath the skeleton.Drag to rotate
Scroll to look insideCC BY 4.0
The exploded view moves structures from their anatomical positions.
The desire to understandthe body has a long history.
Drawn on paper. Modeled in wax. Shared as data. The way we teach anatomy keeps evolving.
- 1543
The body, on paper.
Vesalius publishes the Fabrica, using detailed anatomical illustrations to communicate the structures of the human body.
US National Library of Medicine - 18th c.
Knowledge takes shape.
Anatomical wax modeling flourishes in Florence, giving teaching materials a physical form and a third dimension.
University of Florence - 2007
Anatomy becomes open data.
BodyParts3D is released in Japan, providing a shared foundation for the shapes and positions of human body structures.
Database Center for Life Science - Today
The next chapter is in your hands.
Open models, made accessible in a browser. The JINTAI 3D series brings anatomical knowledge closer to the people learning it.
Explore our model sources
Courtesy of the National Library of Medicine.
Image credits
For people whose knowledgemakes a difference to others.
Anatomy for your everyday.A shared view of the body.
Some relationships are difficult to describe in words alone. Rotate the model and reveal structures to create a shared visual reference when talking about the body.
Open JINTAI 3D Model for freeUnderstand the structure behind movement.
Review a muscle’s shape and its relationship to nearby structures. Compare textbook illustrations with a model as you revisit the anatomy relevant to your work.
Open JINTAI 3D Model for freeBring your questions home from class.
Search for a name, find the structure, and change the angle. Explore JINTAI 3D Book and JINTAI 3D Challenge as you build your own routine for revision.
Open JINTAI 3D Model for freeAn open doorto understanding anatomy.
Specialist learning should be easier to access and afford. We build on anatomy models that the world already shares.
The JINTAI 3D series uses open data from BodyParts3D and Z-Anatomy. By crediting the people behind these resources and preserving their licenses, we connect their work with a browser-based learning experience.
No room for a physical model? No specialist software?
All you need to get started is a browser. Open the current learning tools and see how they fit the way you study.
Built on shared knowledge.
Z-Anatomy
Bones, muscles, and limb peripheral nerves
Gauthier Kervyn & contributorsFollow your curiosity.Find your way in.
Explore with your hands. Put your knowledge to the test. Take time with each structure. Four ways into anatomy.
Explore & understand
JINTAI 3D Model
Find it. Turn it.Make the connection.
Muscles, bones, and organs. Rotate the body, isolate a structure, and open up the layers. Keep what you want to see and explore relationships a flat diagram can make hard to follow.
- Search by name
- Isolate a structure
- Separate the layers
Try & discover
JINTAI 3D Challenge
You’ve seen it.Can you name it?
Touch a muscle. Recognize a shape. Find a structure beneath the layers. Turn observation into a challenge and discover what you know, five questions at a time.
- Touch
- Name
- Shape
- System
- Left or right
- Peel & find
Six ways to play. Five questions per challenge.
Try JINTAI 3D Challenge
Try one question here
Try one question. What is this bone?
Preparing the specimen…
Drag to rotate · Or use the arrow keys
Actual mobile screen · Try it in the app
Read & go deeper
JINTAI 3D Book
Anatomy comesoff the page.
A 3,582-page atlas, from head to lower limb. Search for a structure, turn its specimen around, and see how it sits within the body. Make time to get to know each part.
- Japanese & English name search
- Rotate & enlarge specimens
- See surrounding structures
3,582pages to explore
From head to lower limb. From one structure to the whole body.
Trace sensory regions
JINTAI 3D NeuroMap
Explore sensation.
In three dimensions.
Rotate and zoom the body to explore dermatomes, including the back, arms and legs that a single flat view cannot show.
- Rotate and zoom
- Learning and reference views
- Sensory test points
An educational preview, pending medical review. Not for diagnosis.
Where will youstart today?
All four experiences open without registration.
The JINTAI 3D Book and JINTAI 3D Challenge learning interfaces are primarily in Japanese.
Before you begin.
How much does it cost?
JINTAI 3D Model, JINTAI 3D Book, JINTAI 3D Challenge, and NeuroMap can currently be opened without registration or payment. Future paid plans and pricing have not been set. Our aim is to make anatomical learning easier to access.
Can I use it on my phone?
Use a browser that supports WebGL. The interface adapts to phones, tablets, and computers. Loading 3D models requires an internet connection; performance depends on your device and connection.
Which languages are available?
This page and the JINTAI 3D Model core interface are available in Japanese and English. Some explanations and learning features are primarily in Japanese. Some model labels remain in English.
Can I use it for diagnosis or treatment?
This is an educational anatomy reference, not a tool for diagnostic, treatment, or surgical decisions. The models do not cover every structure or individual variation, and anatomical accuracy in this application has not been fully reviewed by specialists. Some explanatory content was created with AI assistance.
A world of anatomy.In your hands.
Let today’s small discovery become tomorrow’s understanding.
Open JINTAI 3D Model for freeUpdates
Follow new features, model additions and changes awaiting release.
JINTAI 3D NeuroMap is now available
- Explore dermatomes in 3D. Rotate and zoom the body, and switch between learning diagrams, reference views and sensory test points.
- Updated the schematic regions of the shoulders, trunk, lower legs and buttocks.
- An educational preview, pending medical review. Not for diagnosis.
Fixed Studio export framing on high-density screens
- Corrected an extra pixel-ratio scaling that enlarged and cropped the model in preview and exported images.
- Verified the shared Image and Slide PNG renderer at screen pixel ratios of 1, 1.5, 2 and 3.
Anchor Studio labels to anatomy surfaces
- Replaced bounding-box centers with points on the selected mesh surface for thin and curved structures.
- Shared by the editor, preview and PNG export.
View all earlier updates
Included restored joint models in ultrasound free scanning
- The ultrasound preview now uses the registered unified atlas for free scanning, including all 29 restored models.
- Added a connective-tissue visibility control. Section generation was checked for all 29 models; agreement with real ultrasound images has not been validated.
Restored omitted nervous-system source models
- Rechecked source hierarchy and geometry, expanding the Z-Anatomy nervous system from 178 to 542 parts, including brain and spinal structures.
- Added 67 missing parts to the unified atlas, bringing its nervous system to 424 parts. No absent connections were synthesized.
Added 29 source ligament, capsule and nucleus models
- Added bilateral anterior talofibular ligaments, annular ligaments of the radius and elbow joint capsules, plus 23 nucleus pulposus models.
- Available in the Z-Anatomy and unified atlases. Previously imported cruciate ligaments and menisci were retained without duplication.
Added 31 joint and lymph node source models
- Added requested ankle, knee, shoulder, wrist, hip and spinal ligaments, capsules and articular discs, plus cubital and deep popliteal nodes.
- Available in both Z-Anatomy and unified atlases, with lymphatic free scanning in the ultrasound preview.
- Tested sections of bilateral hip and knee capsules did not close; section rendering remains limited.
Completed all 413 joint models in the pinned Z-Anatomy source
- Added the remaining 357 source models to Z-Anatomy and 321 to the unified atlas, preserving existing models without duplicate IDs.
- Both atlases now contain every one of the 413 source joint-category objects. Two lateral temporomandibular ligament source side labels conflict with their placement and are explicitly marked unverified.
- All 413 participate in ultrasound free-scan selection. Tested sections closed for 407 models; bilateral hip capsules, knee capsules and Frenula capsulae retain section-rendering limitations.
Separate fascia visibility and expand the mobile systems list
- Fascia now has a separate switch. Default visibility includes bones, muscles, nerves, ligaments/capsules and separate tendons, with fascia off.
- Removed the redundant systems heading and persistent explanation, and hide restore controls when no parts are hidden to make more room for the list.
Published the Z-Anatomy-based comprehensive model (beta)
- Native Z foundation with 2,907 anatomical models plus seven BP kidney/contact/appearance surfaces.
- 913 normalized-name correspondence candidates; 1,314 unresolved BP models and 30 retained HRA models remain optional comparisons.
- The echo review uses the same native Z frame. Four NC inner-ear surfaces remain without replacements; anatomy and clinical echo validation are incomplete.
Reorganized the systems menu into 12 groups
- Three presets: All, Bones · muscles · nerves, and Organs.
- Grouped tendons, retinacula and bursae separately from ligaments and capsules; moved comparison controls below the anatomical groups.
Purpose-based model selection and restored depth separation
- Unified the model names and purpose descriptions across the picker and comparison dialog, with a small Beta badge for the comprehensive model.
- Restored depth separation in the bones, muscles and nerves model. Source-matched geometry checks preserve valid layouts after model additions; movement of 383 muscle models was verified.
- Removed organ presets and irrelevant system groups from the musculoskeletal model, and removed outdated coverage figures from the comparison dialog.
Use fibrous-tissue colors for retinacula
- Apply the tendon color directly to retinacula, including structures classified upstream as muscles, and to the tendon/retinaculum/bursa display group. Selection highlighting is retained.
Mobile Studio selection and input zoom fixes
- Suppressed text selection and callouts in the interactive model while preserving editable text and long-press image saving.
- Set mobile and touch-device inputs, textareas and selects to 16px to address focus zoom without disabling page zoom.
- Type checks, build and mobile-width computed-style checks passed. Physical iPhone behavior remains unverified; released to production.
First-visit spotlight tutorial
- Replaced the desktop guide with seven spotlight steps for gestures, views, selection, layers, Studio, the menu and app switching.
- Added Back and Skip, saved dismissal state, and replay from Usage guide. Gesture instructions adapt to mouse or touch input.
- Released to production.
Added a draft image-use policy and terms
- Added draft terms naming Yusuke Hanaue as operator. Contact details and effective date remain unconfirmed; the terms are not yet in force.
- The draft covers screenshot reuse, credited commercial use of Studio exports, attribution, educational use, prohibited conduct and responsibility, while preserving upstream CC and statutory rights.
Simplified viewer menu and Studio access
- Kept the top menu while removing its Studio, attachment-list and muscle–tendon–bone shortcuts. Temporarily hid the attachment-view launcher.
- Added a small share-style icon above Select/Hide that opens Studio with the current selection.
- Added a subtle lower-right desktop hint for Shift + left-drag or right-drag panning, hidden on mobile.
Improved preview and mobile image saving
- Fixed preview loss during generation and show an update notice when the composition changes.
- On mobile, display the complete image prominently, collapse settings and keep saving accessible without automatically navigating to a file viewer.
- Unified saving under one Save image action using file sharing when supported and download otherwise, with long-press guidance. Slide exports share the same saving controls.
Improved text, labels and credits
- Choose no text, Japanese, English or both for titles and structure labels. Names and descriptions are editable; custom descriptions are not automatically translated.
- Removed the automatic unselected title. NORMAL starts with names and descriptions hidden.
- Added automatic/left/right label placement, spacing and text backplates. Text detail can be adjusted.
- Exported images retain selection emphasis. The JINTAI 3D logo and source credit remain visible, with a compact credit line and separately accessible full attribution.
Image presets and free composition
- Added NORMAL, FOCUS, ISOLATE and LABEL. NORMAL is first and selected by default; removed the Studio QUIZ preset. Anatomy Challenge quizzes remain available.
- NORMAL preserves composition for manual position, angle and zoom adjustment. Selected structures are highlighted blue in both the viewer and exported PNG.
- FOCUS dims surrounding structures, ISOLATE shows the selection alone, and LABEL adds names and leader lines for multiple structures.
- Added four aspect ratios, DARK/LIGHT themes, a 9:16 safe-area guide, camera directions and AUTO FRAME.
- Camera direction changes preserve pan and zoom even without a selection. Added directional pan buttons; NORMAL does not auto-frame when the selection changes.
JINTAI 3D Studio: image and lecture slide creation
- Added Studio to compose and export PNG images using the existing 3D viewer and structure selection.
- Added Image/Slide navigation beside the Studio name, with dedicated URLs and no duplicate panel heading.
- Lecture slides use a 16:9 layout with the model on either side. Insert available anatomy fields such as origin and insertion, edit the text, and prevent duplicate field insertion.
- Choose visible systems, including organs, vessels and nerves when available in the selected model. Save and load editing settings.
Added a step-by-step ultrasound demo guide
- Three introductory steps cover body selection; six further steps explain probe controls and section viewing.
- Highlights each control and can be replayed with the help button. Available in the ultrasound preview.
Added 19 shoulder ligament and thoracic node shapes
- Added 14 bilateral shoulder ligaments and five thoracic node groups, bringing the unified atlas to 2,551 shapes.
- Deferred one candidate with a source name/location conflict. Ligament attachments are not certified; lymphatic vessels and drainage paths are absent.
Added 30 spinal cord segments
- Registered 30 HRA male spinal cord surface segments to the existing spinal canal, bringing the unified atlas to 2,532 shapes.
- Preserved source segmentation edges. Roots, cauda equina, coccygeal segments and gray/white subdivisions are absent; continuity with the medulla or peripheral nerves is not certified.
Added 73 nerve, joint, lymph node and gland structures to the unified model
- Added both sides of cranial nerves IX–XII and the sympathetic trunks, five thyroid/parathyroid structures, 22 joint structures and 36 lymph node groups. The unified model now contains 2,502 shapes.
- Documented different left/right vagus coverage and source gaps. Lymphatic vessels are not included; missing source shapes were not generated.
- Available in the unified model and recorded in the landing page updates. Physical iPhone/Safari testing remains pending.
Five-question muscle challenge
- Added a fixed five-question Z-Anatomy surface-muscle challenge.
- Start after a countdown and total answer time only. Correct answers highlight the muscle; wrong answers do not hide parts.
- Show per-question and total times, share/copy results and link to the same course. Interrupted runs are labeled practice.
OpenSim JAM knee playback
- Added right passive knee flexion using Lenhart 2015 bones/cartilage and published simulation results, approximately 0–90 degrees.
- Replay tibial and patellar rotations and translations without the previous circle or separation correction.
- Added time scrubbing, end stop, restart, close-up and source/validation details.
- Other joints remain Z-Anatomy prototypes. Motion mode is accessible from either atlas.
Simplified joint motion controls
- Removed fixed-axis comparison, separation correction and axis controls; retained roll/glide as the default for elbows and knee flexion.
- Grouped playback, reset, zoom and explanation controls; moved documentation into an on-demand sheet.
- Start with a joint close-up and list only implemented motions. Other joints remain labeled as basic prototypes.
Animated return from focus
- Added a 0.65-second zoom-out when leaving focus, with interaction cancellation and reduced-motion support.
Region navigation and selected names
- Added smooth camera navigation to shoulders, waist, knees and feet in both models.
- Show selected names above the action buttons without opening explanations.
Clarified Japanese drag instructions
- Standardized left/right click-and-drag wording in the desktop guide.
Renamed the site to JINTAI 3D and moved its URL
- Updated the opening, menu and browser title to JINTAI 3D.
- Moved to jintai-3d.pages.dev with redirects from human-atlas.pages.dev.
Basic hip, shoulder and neck motions
- Added hip/shoulder flexion-extension and neck flexion-extension/lateral bending; verified ankle dorsiflexion/plantarflexion.
- Use eight provisional cervical segments. Shoulder flexion is limited to a 120-degree test range while retaining the separate 180-degree reference.
- Group available motions first and improve joint close-up viewpoints.
Knee rolling/sliding test and joint close-up
- Added an ideal-circle model for left/right knee flexion with a fixed femur, representing an unloaded configuration.
- Added joint close-up and whole-limb views, with separate elbow/knee parameters.
- Not fitted to real joint surfaces; compartment differences, axial rotation, menisci and patellar coupling remain unmodeled.
Experimental elbow rolling and sliding geometry
- Compare fixed-axis rotation with an ideal tangent-circle model for both elbows.
- Optional virtual contact circles and mathematical instantaneous axes, with adjustable uncalibrated parameters.
- Not fitted to bone surfaces or measured trajectories. Legacy separation is not applied.
Disabled visual position correction by default
- Keep position correction off by default and retain it for comparison. Rotation-axis calibration remains incomplete.
Optional provisional rotation axes
- Toggle faint reference and translated axes, distinguished by color and line style.
- Toggle visual position correction for comparison. These axes are not measured instantaneous joint axes.
Smoothed joint position correction
- Replaced per-frame separation with bounded, continuously interpolated correction, introduced gradually from zero.
- Prioritize continuous motion in the experimental viewer; residual bone intersections are disclosed.
Marked joint motion as an experimental feature
- Added an experimental badge to the menu entry and joint viewer heading.
- Keep a notice visible during use that bone motion and position corrections are under validation and do not accurately reproduce real joint motion.
Collision clearance in the joint viewer
- Added per-pose geometric separation against fixed bones, including the ulna at the wrist and fibula at the ankle.
- Display correction distance separately from physiological roll/glide. Prepared a separate kinematics research master.
Prototype joint motion viewer
- Added approximate skeletal motion for elbows, wrists, knees and ankle flexion with side selection, angle control and playback.
- Separated 61 reference angles from rig data. Corrected thumb MCP extension and trunk bending/rotation against the standard; other motions remain reference-only.
Front/back muscle separation
- Added Z-Anatomy muscle depth separation with fixed bones and nerves and rigid muscle geometry.
- Adjust spacing and rotate to inspect overlap. Geometric separation is not anatomical layer classification. The original inventory mode remains available.
Corrected muscles appearing in skeleton mode
- Reclassified 14 BodyParts3D muscle parts and two iliotibial tract parts previously assigned to the skeleton. Added generation overrides and validation.
Quiz entrance and randomized rounds
- Separated atlas and quiz entrances.
- Draw five of ten muscle questions, with randomized full-body views and names revealed at GO.
- Added a dedicated sharing page and social image.
Published three anatomy quizzes
- Added a hub for surface-muscle Touch Challenge, highlighted-muscle identification and isolated-shape identification.
- Added large correct/incorrect symbols and feedback.
- Unified quiz terminology; excluded the memory activity.
Select multiple parts
- Tap to add or remove individual parts. Focus or hide the selection together, and undo a batch hide.
Original colors while focused
- Focused parts retain their original colors without pulsing. Selection highlights return when leaving focus.
Actual model previews on the opening screen
- Added images rendered from the included geometry to both model choices.
Opening model selection
- A fading title introduces two choices: whole body and organs on the left, bones, muscles and peripheral nerves on the right.
- Review the selected model and usage notes, then press OK to begin.
Left-side view and tool controls
- Stacked view and rotation controls at the upper left. Explode and system buttons at the lower left open bottom panels.
Reorganized the menu and explanation layout
- Moved view controls into one scrollable Menu with a vertical layout.
- Kept Select and Hide modes on the side, with explanations below a separate model viewport.
Collapsible viewing controls
- Small edge tabs reveal model, search and auxiliary controls. Interacting with the model hides them.
- Moved the explosion slider into an optional disclosure while keeping selection, focus and undo accessible.
Animated focus zoom
- Smoothly zoom toward the selected part over 0.65 seconds while preserving the viewing direction.
- Direct camera interaction interrupts the transition. Reduced-motion preferences skip the animation.
Direct focus and undo controls
- Added Focus to selection actions to isolate, enlarge and rotate selected parts, with an exit back to the whole model.
- After hiding parts, show Undo with the remaining action count and Restore all directly on the scene.
Fade out hidden parts
- Hidden parts fade out gently over 0.32 seconds in both models.
- Hidden parts stop receiving clicks immediately. Undo restores them immediately, and reduced-motion preferences skip the animation.
Added a full, scrollable update history
- Listed all recorded changes, newest first.
- Count updates automatically, separately from the initial version and research records.
- Keep the heading visible while scrolling through the full history.
Corrected mirrored surface orientation
- Fixed mismatches between triangle winding and lighting normals in mirrored Z-Anatomy parts.
- Corrected 547 parts, including the left plantar aponeurosis, while preserving positions and triangle membership.
- Validated all 1,138 parts and versioned the geometry to avoid stale cached data.
Refined the selection colors
- Changed warm-part highlights to peacock blue and cool-part highlights to rose.
- Reduced the glow and slowed the pulse to approximately 2.8 seconds.
Removed the floor for views from underneath
- Removed the floor, platform and decorative rings.
- Expanded the vertical orbit range to allow viewing the soles from below.
Show three actions when selecting a part
- Stopped opening the explanation automatically when a part is selected.
- Show Details, Hide parts and Clear selection buttons.
- Open the existing explanation panel only when Details is pressed, in both models.
Made selected parts easier to identify
- Added blue highlights for warm-colored parts and magenta for cool-colored parts.
- Added a gentle 2.2-second pulse, disabled when reduced motion is requested.
- Localized close-button labels, the glossary heading and the Z-Anatomy source description.
Japanese translation audit
- Reviewed 2,137 untranslated name records, representing 1,455 distinct English labels, with candidates and unresolved questions.
- Classified 608 note fields containing Latin characters, including untranslated text, abbreviations, names and notation.
- This records research, not a completed or published translation of all terms.
Added Z-Anatomy and peripheral limb nerves
- Added 1,138 parts, including skeletal, muscular and connective structures and 178 peripheral limb nerve parts.
- Added model switching and a comparison of coverage, use cases and licenses.
- Added Select/Hide modes, individual hiding, undo and restore for both models.
- Added a desktop-only guide to rotation, panning and zoom.
- Added an in-app update history.
Initial atlas: explore the whole body
- Included 2,234 BodyParts3D parts, 3,432 searchable concepts and 15 systems.
- Added orbit, zoom, pan, preset views and automatic rotation.
- Added system visibility, search, isolation and an exploded part inventory.
- Added Japanese/English switching, a bilingual glossary, and general/clinical explanations. Some names remain untranslated.
- Adapted panels for mobile and added source credits, licenses and usage information.