# Heart internal anatomy and conduction model

Heart Atlas contributors, licensed under **Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)**.

BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International.

Sources:

- Heart Atlas source model: https://github.com/w3lld1/heart-atlas/blob/main/assets/models/heart/heart.glb
- Asset license register: https://github.com/w3lld1/heart-atlas/blob/main/assets/models/LICENSES.yaml
- Content license: https://github.com/w3lld1/heart-atlas/blob/main/LICENSE-CONTENT
- CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/
- CC BY-SA 4.0 full terms: https://creativecommons.org/licenses/by-sa/4.0/legalcode
- BodyParts3D 4.0 source: https://dbarchive.biosciencedbc.jp/en/bodyparts3d/download.html
- BodyParts3D official CC BY 4.0 grant: https://dbarchive.biosciencedbc.jp/en/bodyparts3d/lic.html
- BodyParts3D license: https://creativecommons.org/licenses/by/4.0/

## Changes

Heart Atlas contributors selected and grouped BodyParts3D elements, converted
millimeters and Z-up coordinates into meters and Y-up coordinates, centered the
model, assigned illustrative colors, and added a schematic conduction system.

kingt.ai extracted four valves, bilateral papillary muscles, cardiac and great
veins, and the schematic conduction system. It registered these meshes to its
existing BodyParts3D heart shell using uniform scaling and translation, checked
all vertices of four shared structures, preserved the triangles and colors, and
embedded attribution and provenance metadata. The adapted internals.glb remains
licensed under CC BY-SA 4.0. Retain these credits, license links, and modification
notices when redistributing this model or adaptations.

## Conduction schematic

The SA node, AV node, His bundle, bundle branches, and Purkinje paths are a
teaching schematic authored by Heart Atlas contributors, not measured nodal
tissue and not cardiac nerves. Their placement follows:

Anderson RH, Yanni J, Boyett MR, Chandler NJ, Dobrzynski H. The anatomy of the
cardiac conduction system. Clin Anat. 2009;22:99–113.
https://doi.org/10.1002/ca.20700

No chordae tendineae or cardiac nerves were invented or added as separate layers.
The original valve meshes include filament-like geometry; they are preserved in
full without independently relabeling those filaments. The leaflet,
papillary-muscle, and vein surfaces come from the named BodyParts3D elements in
structures.yaml. No endorsement by Heart Atlas contributors or DBCLS is implied.

The kingt.ai website changes runtime materials, applies illustrative heartbeat deformation, adds iridescent reflections and translates structure groups for an exploded view. Assembled coordinates are preserved.

The current presentation applies partially transparent silver metallic materials and physical thin-film iridescent reflections to all visible anatomical components.