| Originscapula: | Acromial angle. |
| Zscapula: | The line connecting the root of the spine and the acromial angle, pointing toward the acromial angle. |
| Xscapula: | The line perpendicular to the plane formed by the inferior angle, acromial angle, and root of the spine, pointing forward. |
| Yscapula: | The line perpendicular to Xscapula and Zscapula, pointing upward. |
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