Where everything comes from.

The 3D anatomy model

Anatomy model: Z-Anatomy (CC BY-SA 4.0), derived from BodyParts3D, © The Database Center for Life Science (CC BY-SA 2.1 Japan). BodyParts3D, Copyright© The Database Center for Life Science licensed by CC Attribution-Share Alike 2.1 Japan.

• Z-Anatomy (github.com/Z-Anatomy/Models-of-human-anatomy) — an open, hand-refined anatomy model built on BodyParts3D. Licence: CC BY-SA 4.0.
• BodyParts3D, © The Database Center for Life Science — licensed CC Attribution-Share Alike 2.1 Japan (as stated in the original files). The BodyParts3D 4.0 records are used here only to show FMA/BP identifiers next to matching structures.
• Share-alike: because the model is CC BY-SA, the converted model files on this site (assets/models/*.glb) are also shared under CC BY-SA 4.0. You may reuse them with the same attribution and licence. The site's own text and code are separate.
• The male body comes from these two datasets, which model an adult male.

The female model

Female model: Human Reference Atlas 3D Reference Organs, United Female v1.10 and Pelvis v1.3 (HuBMAP, CC BY 4.0), and lower-limb geometry by Andreassen et al., University of Denver (CC BY 4.0), both from the Visible Human Female (US National Library of Medicine); skull, rib, shoulder and arm bones borrowed from the male model.

• Human Reference Atlas — 3D Reference Organ Set, United Female v1.10 (lod.humanatlas.io/ref-organ/united-female) and Pelvis, Female v1.3 for the ischium and pubis that v1.10 leaves out. Published by HuBMAP (Kristen Browne, Heidi Schlehlein), built on the Visible Human Female from the US National Library of Medicine. Licence: CC BY 4.0.
• Lower limb — Andreassen et al., “Three-dimensional lower extremity musculoskeletal geometry of the Visible Human Female and Male”, Scientific Data 2022 (doi:10.1038/s41597-022-01905-2; data doi:10.56902/COB.vh.2022.0), Center for Orthopaedic Biomechanics, University of Denver, NIH grant U01 AR072989. Licence: CC BY 4.0. Used here: 76 hip and leg muscles, her foot bones, and hip and ankle cartilage. The scan's legs are posed differently from the HRA body, so each segment (pelvis, thighs, lower legs) was matched to the HRA bones of the same woman (mean surface gap about 2–3 mm), muscles that cross a joint were blended between neighbouring segments, and each foot was turned at the ankle to her standing skin.
• Borrowed bones. The open female sets have no skull, ribs or costal cartilages, shoulder girdle, or arm and hand bones, and no muscle above the hips. Those bones are taken from the male Z-Anatomy skeleton and placed by region: scaled to her head, thorax and arm length, and turned to her arm pose. Their shape is the male shape; nothing is re-modelled or invented. Each one says “Borrowed from the male model” in its details panel.
• Not borrowed: no muscles or organs. Female muscles cover the hips and legs (plus the eye muscles); the trunk and arms have no open female muscle data yet, so the split view shows skin with the leg muscles, against bone. The female set also has no stomach, oesophagus, thyroid gland or adrenal glands; these are disclosed, not filled in. The HRA's full-term placenta set (a pregnancy reference organ) and its thin fat layers are left out, because they are not part of this non-pregnant reference body. Breast tissue (mammary lobes, ducts, nipple and areola) is modelled in the female set.
• Under review. The female model's proportions and placement are being independently reviewed by an anatomist; until that is done the Explorer shows a visible note saying so.
• Licences together: the combined female files mix CC BY 4.0 (HRA) and CC BY-SA 4.0 (borrowed Z-Anatomy bones), so they are shared under the stricter CC BY-SA 4.0.

How the model was converted

The Z-Anatomy Blender scene was opened without running its embedded scripts, and each body system was exported with modifiers applied, triangulated, and compressed with Draco (glTF 2.0). Every structure keeps its original Z-Anatomy name (for example “Femur.l”). Curved vessels and nerves were converted to meshes. A lighter version of each pack is served to phones. Layers that wrap the muscles (fascia, sheaths, bursae) are kept in the data but hidden by default. Colours and materials are viewing aids added in the browser. 3,163 structures are selectable, plus 1,187 searchable landmarks taken from Z-Anatomy's label points.

The Explorer checks each file's size as it downloads. SHA-256 values let you verify the files.

Reference text in the Explorer

For minor structures without a written Human Atlas explanation, the Explorer shows a short reference excerpt from Wikipedia articles bundled with Z-Anatomy (CC BY-SA). These excerpts are labelled as such and have not been medically reviewed.

Illustrations

The tumour shapes in “Cancer concept” mode and the rings and colour changes in the age timeline are teaching overlays added by Human Atlas. They are not part of the anatomy data, do not show real tumours or measurements, and never assign a stage.

Software and fonts

• three.js r180 and its Draco decoder — MIT licence (assets/vendor/three/LICENSE.txt).
• Guided-lesson narration: a computer-generated voice (“George”) recorded with the open Kokoro-82M speech model — Apache 2.0 licence. It is a synthetic voice, not a recording of a real person. Other read-aloud buttons use your device’s own voice.
• Fonts Inter, Space Grotesk and IBM Plex Mono — SIL Open Font License 1.1, served from this site (assets/fonts/). No fonts or scripts are loaded from other websites.

Health and medical references

Every cited source on the site, in one list. Each page also lists its own sources at the bottom.

1. 988 Suicide & Crisis Lifeline. 988 Suicide & Crisis Lifeline. Checked 23 October 2026. [988]
2. American Cancer Society. American Cancer Society Recommendations for Prostate Cancer Early Detection. Checked 23 October 2026. [acs-prostate-early]
3. American Cancer Society. Colorectal Cancer Risk Factors. Checked 23 October 2026. [acs-crc-risk]
4. American Cancer Society. Colorectal Cancer Signs and Symptoms. Checked 23 October 2026. [acs-crc-signs]
5. American Cancer Society. Key Statistics About Kidney Cancer (2026 estimates). Checked 23 October 2026. [acs-kidney-stats]
6. American Cancer Society. Key Statistics About Liver Cancer (2026 estimates). Checked 23 October 2026. [acs-liver-stats]
7. American Cancer Society. Key Statistics for Bladder Cancer (2026 estimates). Checked 23 October 2026. [acs-bladder-stats]
8. American Cancer Society. Key Statistics for Breast Cancer in Men (2026 estimates). Checked 23 October 2026. [acs-mbc-stats]
9. American Cancer Society. Key Statistics for Colorectal Cancer (2026 estimates). Checked 23 October 2026. [acs-crc-stats]
10. American Cancer Society. Key Statistics for Lung Cancer (2026 estimates). Checked 23 October 2026. [acs-lung-stats]
11. American Cancer Society. Key Statistics for Melanoma Skin Cancer (2026 estimates). Checked 23 October 2026. [acs-melanoma-stats]
12. American Cancer Society. Key Statistics for Oral Cavity and Oropharyngeal Cancers (2026 estimates). Checked 23 October 2026. [acs-oral-stats]
13. American Cancer Society. Key Statistics for Pancreatic Cancer (2026 estimates). Checked 23 October 2026. [acs-pancreas-stats]
14. American Cancer Society. Key Statistics for Prostate Cancer (2026 estimates). Checked 23 October 2026. [acs-prostate-stats]
15. American Cancer Society. Key Statistics for Testicular Cancer (2026 estimates). Checked 23 October 2026. [acs-testicular-stats]
16. American Cancer Society. Lung Cancer Risk Factors. Checked 23 October 2026. [acs-lung-risk]
17. American Cancer Society. Prostate Cancer Risk Factors. Checked 23 October 2026. [acs-prostate-risk]
18. American Cancer Society. Signs and Symptoms of Liver Cancer. Checked 24 October 2026. [acs-liver-signs]
19. American Cancer Society. Signs and Symptoms of Prostate Cancer. Checked 23 October 2026. [acs-prostate-signs]
20. American Cancer Society. Signs and Symptoms of Testicular Cancer. Checked 23 October 2026. [acs-testicular-signs]
21. American Cancer Society. Testicular Cancer Risk Factors. Checked 23 October 2026. [acs-testicular-risk]
22. American Heart Association News. Erectile dysfunction may be warning sign for more serious health problems (2018). Checked 23 October 2026. [aha-ed-news]
23. Bhasin S, et al. J Clin Endocrinol Metab 2018;103(5):1715–1744. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. Checked 23 October 2026. [endo-guideline]
24. Bone Health & Osteoporosis Foundation. Bone Density Exam/Testing. Checked 23 October 2026. [bhof-bmd]
25. Centers for Disease Control and Prevention. Adult Immunization Schedule by Age (check the live page: the schedule has been amended more than once in 2025–26). Checked 23 October 2026. [cdc-adult-schedule]
26. Centers for Disease Control and Prevention. Heart Attack Symptoms, Risk, and Recovery. Checked 23 October 2026. [cdc-heart-attack]
27. Centers for Disease Control and Prevention. Heart Disease Facts. Checked 23 October 2026. [cdc-heart-stats]
28. Centers for Disease Control and Prevention. Heart Disease Risk Factors. Checked 23 October 2026. [cdc-heart-risk]
29. Centers for Disease Control and Prevention. High Blood Pressure Facts. Checked 23 October 2026. [cdc-bp-stats]
30. Centers for Disease Control and Prevention. National Diabetes Statistics Report. Checked 23 October 2026. [cdc-diabetes-stats]
31. Centers for Disease Control and Prevention. Pneumococcal Vaccines. Checked 23 October 2026. [cdc-pneumo]
32. Centers for Disease Control and Prevention. RSV Vaccine Guidance for Adults. Checked 23 October 2026. [cdc-rsv]
33. Centers for Disease Control and Prevention. Shingles Vaccination. Checked 23 October 2026. [cdc-shingles]
34. Centers for Disease Control and Prevention. Signs and Symptoms of Stroke. Checked 23 October 2026. [cdc-stroke]
35. Centers for Disease Control and Prevention. Suicide Data and Statistics. Checked 23 October 2026. [cdc-suicide-data]
36. Endocrine Society. Hypogonadism in Men (patient resource). Checked 23 October 2026. [endo-hypogonadism]
37. MedlinePlus (US National Library of Medicine). Anaphylaxis. Checked 23 October 2026. [medline-anaphylaxis]
38. MedlinePlus (US National Library of Medicine). Testicular torsion. Checked 23 October 2026. [medline-torsion]
39. NIH National Heart, Lung, and Blood Institute. Aortic Aneurysm. Checked 24 October 2026. [nhlbi-aneurysm]
40. NIH National Heart, Lung, and Blood Institute. Aortic Aneurysm: Causes and Risk Factors. Checked 24 October 2026. [nhlbi-aneurysm-causes]
41. NIH National Heart, Lung, and Blood Institute. Aortic Aneurysm: Symptoms. Checked 24 October 2026. [nhlbi-aneurysm-sym]
42. NIH National Heart, Lung, and Blood Institute. Aortic Aneurysm: Treatment. Checked 24 October 2026. [nhlbi-aneurysm-tx]
43. NIH National Heart, Lung, and Blood Institute. Atherosclerosis. Checked 23 October 2026. [nhlbi-atherosclerosis]
44. NIH National Heart, Lung, and Blood Institute. Coronary Heart Disease. Checked 23 October 2026. [nhlbi-chd]
45. NIH National Heart, Lung, and Blood Institute. Coronary Heart Disease: Diagnosis. Checked 23 October 2026. [nhlbi-chd-dx]
46. NIH National Heart, Lung, and Blood Institute. Coronary Heart Disease: Treatment. Checked 23 October 2026. [nhlbi-chd-tx]
47. NIH National Heart, Lung, and Blood Institute. Heart Attack. Checked 23 October 2026. [nhlbi-heart-attack]
48. NIH National Heart, Lung, and Blood Institute. High Blood Pressure. Checked 23 October 2026. [nhlbi-hbp]
49. NIH National Heart, Lung, and Blood Institute. How the Heart Works: Anatomy. Checked 23 October 2026. [nhlbi-heart]
50. NIH National Heart, Lung, and Blood Institute. Sleep Apnea. Checked 23 October 2026. [nhlbi-sleep-apnea]
51. NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. Back Pain. Checked 23 October 2026. [niams-back-pain]
52. NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. Gout. Checked 23 October 2026. [niams-gout]
53. NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. Osteoarthritis. Checked 23 October 2026. [niams-oa]
54. NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. Osteoporosis. Checked 23 October 2026. [niams-osteo]
55. NIH National Institute of Arthritis and Musculoskeletal and Skin Diseases. Osteoporosis in Men. Checked 23 October 2026. [niams-osteo-men]
56. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Definition & Facts for Erectile Dysfunction. Checked 23 October 2026. [niddk-ed-facts]
57. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Diabetes Tests & Diagnosis. Checked 23 October 2026. [niddk-diabetes-tests]
58. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Erectile Dysfunction (ED). Checked 23 October 2026. [niddk-ed]
59. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Inguinal Hernia. Checked 23 October 2026. [niddk-hernia]
60. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Metabolic Dysfunction-associated Steatotic Liver Disease (MASLD). Checked 23 October 2026. [niddk-masld]
61. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Prostate Enlargement (Benign Prostatic Hyperplasia). Checked 23 October 2026. [niddk-bph]
62. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Risk Factors for Type 2 Diabetes. Checked 23 October 2026. [niddk-diabetes-risk]
63. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Diabetes. Checked 23 October 2026. [niddk-diabetes-symptoms]
64. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Erectile Dysfunction. Checked 23 October 2026. [niddk-ed-causes]
65. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Treatment for Erectile Dysfunction. Checked 23 October 2026. [niddk-ed-tx]
66. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Type 2 Diabetes. Checked 23 October 2026. [niddk-t2d]
67. NIH National Institute of Diabetes and Digestive and Kidney Diseases. Your Digestive System & How It Works. Checked 23 October 2026. [niddk-digestive]
68. NIH National Institute of Mental Health. 5 Action Steps to Help Someone Having Thoughts of Suicide. Checked 24 October 2026. [nimh-5-steps]
69. NIH National Institute of Mental Health. Depression. Checked 23 October 2026. [nimh-depression]
70. NIH National Institute of Mental Health. Depression (publication). Checked 23 October 2026. [nimh-depression-pub]
71. NIH National Institute of Mental Health. Men and Depression. Checked 23 October 2026. [nimh-men-depression]
72. NIH National Institute of Mental Health. Suicide Prevention. Checked 23 October 2026. [nimh-suicide]
73. National Cancer Institute. Bladder Cancer Causes and Risk Factors. Checked 24 October 2026. [nci-bladder-risk]
74. National Cancer Institute. Bladder Cancer Symptoms. Checked 24 October 2026. [nci-bladder-symptoms]
75. National Cancer Institute. Bladder Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-bladder-tx]
76. National Cancer Institute. Cancer Staging. Checked 23 October 2026. [nci-staging]
77. National Cancer Institute. Colon Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-colon-tx]
78. National Cancer Institute. Colorectal Cancer Prevention (PDQ®) – Patient Version. Checked 23 October 2026. [nci-crc-prevention]
79. National Cancer Institute. Colorectal Cancer Screening (PDQ®) – Patient Version. Checked 23 October 2026. [nci-crc-screening]
80. National Cancer Institute. Common Moles, Dysplastic Nevi, and Risk of Melanoma. Checked 24 October 2026. [nci-moles]
81. National Cancer Institute. HPV and Cancer. Checked 23 October 2026. [nci-hpv]
82. National Cancer Institute. Liver (Hepatocellular) Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-liver-tx]
83. National Cancer Institute. Liver Cancer Causes, Risk Factors, and Prevention. Checked 24 October 2026. [nci-liver-risk]
84. National Cancer Institute. Lung Cancer Prevention (PDQ®) – Patient Version. Checked 23 October 2026. [nci-lung-prevention]
85. National Cancer Institute. Lung Cancer Screening (PDQ®) – Patient Version. Checked 23 October 2026. [nci-lung-screening]
86. National Cancer Institute. Male Breast Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-mbc-tx]
87. National Cancer Institute. Melanoma Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-melanoma]
88. National Cancer Institute. Non-Small Cell Lung Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-nsclc-tx]
89. National Cancer Institute. Oropharyngeal Cancer Treatment (Adult) (PDQ®) – Patient Version. Checked 23 October 2026. [nci-oropharyngeal-tx]
90. National Cancer Institute. Pancreatic Cancer Causes and Risk Factors. Checked 24 October 2026. [nci-pancreas-risk]
91. National Cancer Institute. Pancreatic Cancer Symptoms. Checked 24 October 2026. [nci-pancreas-symptoms]
92. National Cancer Institute. Pancreatic Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-pancreas-tx]
93. National Cancer Institute. Prostate Cancer Screening (PDQ®) – Patient Version. Checked 23 October 2026. [nci-prostate-screening]
94. National Cancer Institute. Prostate Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-prostate-tx]
95. National Cancer Institute. Renal Cell Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-kidney-tx]
96. National Cancer Institute. Skin Cancer Screening (PDQ®) – Patient Version. Checked 23 October 2026. [nci-skin-screening]
97. National Cancer Institute. Testicular Cancer Screening (PDQ®) – Patient Version. Checked 23 October 2026. [nci-testicular-screening]
98. National Cancer Institute. Testicular Cancer Treatment (PDQ®) – Patient Version. Checked 23 October 2026. [nci-testicular-tx]
99. National Cancer Institute. Types of Cancer Treatment. Checked 23 October 2026. [nci-tx-types]
100. National Cancer Institute. Understanding Prostate Changes: A Health Guide for Men. Checked 23 October 2026. [nci-prostate-changes]
101. National Cancer Institute. What Is Cancer?. Checked 23 October 2026. [nci-what-is-cancer]
102. National Cancer Institute SEER Training Modules. Appendicular Skeleton. Checked 23 October 2026. [seer-appendicular]
103. National Cancer Institute SEER Training Modules. Axial Skeleton. Checked 23 October 2026. [seer-axial]
104. National Cancer Institute SEER Training Modules. Heart. Checked 23 October 2026. [seer-heart]
105. National Cancer Institute SEER Training Modules. Introduction to the Digestive System. Checked 23 October 2026. [seer-digestive]
106. National Cancer Institute SEER Training Modules. Introduction to the Endocrine System. Checked 23 October 2026. [seer-endocrine]
107. National Cancer Institute SEER Training Modules. Introduction to the Lymphatic System. Checked 23 October 2026. [seer-lymphatic]
108. National Cancer Institute SEER Training Modules. Introduction to the Muscular System. Checked 23 October 2026. [seer-muscular]
109. National Cancer Institute SEER Training Modules. Introduction to the Nervous System. Checked 23 October 2026. [seer-nervous]
110. National Cancer Institute SEER Training Modules. Introduction to the Respiratory System. Checked 23 October 2026. [seer-respiratory]
111. National Cancer Institute SEER Training Modules. Introduction to the Skeletal System. Checked 23 October 2026. [seer-skeletal]
112. National Cancer Institute SEER Training Modules. Introduction to the Urinary System. Checked 23 October 2026. [seer-urinary]
113. National Cancer Institute SEER Training Modules. Kidneys. Checked 23 October 2026. [seer-kidney]
114. National Cancer Institute SEER Training Modules. Male Reproductive System. Checked 23 October 2026. [seer-male]
115. Siparsky PN, Kirkendall DT, Garrett WE Jr. Sports Health 2014;6(1):36–40. Muscle Changes in Aging: Understanding Sarcopenia (peer-reviewed review). Checked 23 October 2026. [sarcopenia-review]
116. US Department of Health and Human Services. Physical Activity Guidelines for Americans: Top 10 Things to Know. Checked 23 October 2026. [hhs-pag]
117. US Preventive Services Task Force. Abdominal Aortic Aneurysm: Screening (December 2019). Checked 23 October 2026. [uspstf-aaa]
118. US Preventive Services Task Force. Colorectal Cancer: Screening (May 2021). Checked 23 October 2026. [uspstf-crc]
119. US Preventive Services Task Force. Depression and Suicide Risk in Adults: Screening (June 2023). Checked 23 October 2026. [uspstf-depression]
120. US Preventive Services Task Force. Hypertension in Adults: Screening (April 2021). Checked 23 October 2026. [uspstf-bp]
121. US Preventive Services Task Force. Lung Cancer: Screening (final recommendation, March 2021). Checked 23 October 2026. [uspstf-lung]
122. US Preventive Services Task Force. Osteoporosis to Prevent Fractures: Screening (January 2025). Checked 23 October 2026. [uspstf-osteo]
123. US Preventive Services Task Force. Prediabetes and Type 2 Diabetes: Screening (August 2021). Checked 23 October 2026. [uspstf-diabetes]
124. US Preventive Services Task Force. Prostate Cancer: Screening (May 2018; an update is in progress). Checked 23 October 2026. [uspstf-prostate]
125. US Preventive Services Task Force. Skin Cancer: Screening (April 2023). Checked 24 October 2026. [uspstf-skin]
126. US Preventive Services Task Force. Statin Use for the Primary Prevention of Cardiovascular Disease in Adults (August 2022). Checked 23 October 2026. [uspstf-statin]
127. US Preventive Services Task Force. Testicular Cancer: Screening (April 2011). Checked 23 October 2026. [uspstf-testicular]

The owner of this website is not a doctor. Human Atlas provides educational anatomy information and does not diagnose, stage, or treat disease. Talk to a qualified clinician about anything concerning your own health.