> For the complete documentation index, see [llms.txt](https://docs.optitrack.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.optitrack.com/v3.4/markersets/hand-and-fingers/left-right-hand-4.md).

# Left/Right Hand (4) Active

<div><figure><img src="/files/Fd6tkPRo2r6zQF5Xytfh" alt=""><figcaption><p>Left Hand Marker Set</p></figcaption></figure> <figure><img src="/files/7yekGRPamoPAfKOl6teT" alt=""><figcaption><p>Right Hand Marker Set</p></figcaption></figure></div>

### Hand + Finger Markers

| Label                         | Related Segment | Description                                                                                                                                                                                                |
| ----------------------------- | --------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| <p>LWristOut<br>RWristOut</p> | Fore Arm / Hand | Place the marker on the outside (lateral side) of the wrist axis. (distal end of the radius bone). Note that the wrist axis is not always located on the protruding bone but 1-2 cm more towards the hand. |
| <p>LWristIn<br>RWristIn</p>   | Fore Arm / Hand | Place the marker on the inner prominence (medial side) of the wrist axis (distal end of the ulnar bone).                                                                                                   |
| <p>LHandOut<br>RHandOut</p>   | Hand            | Place the marker slightly below the pinky knuckle. More specifically, between distal end of the fifth and fourth metacarpal bones.                                                                         |
| <p>LHandIn<br>RHandIn</p>     | Hand            | Place the marker slightly below the forefinger knuckle. More specifically, between distal end of the second metacarpal bones.                                                                              |


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