# Vein

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

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

| Name | Type | Description |
|---|---|---|
| drainsTo | [Vessel](https://developers.google.com/workspace/gmail/markup/reference/types/Vessel) | The vasculature that the vein drains into. |
| regionDrained | [AnatomicalStructure](https://developers.google.com/workspace/gmail/markup/reference/types/AnatomicalStructure) or [AnatomicalSystem](https://developers.google.com/workspace/gmail/markup/reference/types/AnatomicalSystem) | The anatomical or organ system drained by this vessel; generally refers to a specific part of an organ. |
| tributary | [AnatomicalStructure](https://developers.google.com/workspace/gmail/markup/reference/types/AnatomicalStructure) | The anatomical or organ system that the vein flows into; a larger structure that the vein connects to. |