Tenebrae Institute uses the Brain Project 3D anatomy asset.

Model: brain.glb
Copyright: Z-Anatomy contributors and BodyParts3D / DBCLS
License: Creative Commons Attribution-ShareAlike 4.0 International
Source: https://github.com/itayinbarr/brainproject
License text: https://creativecommons.org/licenses/by-sa/4.0/

Viewer integration in this site is original Tenebrae Institute code. Three.js is distributed under the MIT License.