# Joint

Type name: [Joint](https://developers.google.com/workspace/gmail/markup/reference/types/Joint)

Extends [AnatomicalStructure](https://developers.google.com/workspace/gmail/markup/reference/types/AnatomicalStructure)

| Name | Type | Description |
|---|---|---|
| biomechnicalClass | [Text](https://developers.google.com/workspace/gmail/markup/reference/types/Text) | The biomechanical properties of the bone. |
| functionalClass | [Text](https://developers.google.com/workspace/gmail/markup/reference/types/Text) | The degree of mobility the joint allows. |
| structuralClass | [Text](https://developers.google.com/workspace/gmail/markup/reference/types/Text) | The name given to how bone physically connects to each other. |