# Facial anatomy supplement

This supplement contains **37 existing rest surfaces: 36 muscles and one galea aponeurotica**. No new anatomy was created by this packaging step.

- **30 Z-Anatomy muscles:** Z-Anatomy, Gauthier Kervyn and contributors; original BodyParts3D by The Database Center for Life Science / Kousaku Okubo. These registered derivatives retain **CC BY-SA 4.0** and the upstream historical BodyParts3D CC BY-SA 2.1 Japan attribution.
- **Six illustrative muscles and the galea:** existing paired frontalis, buccinator and transverse nasalis reconstructions, plus the galea aponeurotica, fitted to the native BodyParts3D head. These are separately labelled **CC BY 4.0** derivatives using the current BodyParts3D fitting reference.

The combined packaged adaptation is distributed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/). See the retained [full notice](NOTICE.txt), [Z-Anatomy source](https://github.com/Z-Anatomy/Models-of-human-anatomy), and [BodyParts3D attribution](https://dbarchive.biosciencedbc.jp/en/bodyparts3d/lic.html).

Packaging evaluates the existing rest geometry and authored subdivision, rotates the coordinate axes without scaling, packs normals, and applies lossless gzip. Geometry remains in its existing rigid skull registration; [registration measurements](registration.json) and [export parity evidence](export-proof.json) are included. This alignment is **not medically validated**. The six constructed muscle surfaces and galea remain illustrative, and this subset is not complete facial anatomy. Existing eye/cartilage context and the two hidden illustrative temporal fascia meshes are omitted.