What's this weird thing I can do with my hand?

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SUMMARY

The discussion centers on a unique hand movement involving the fourth finger and palm, specifically the manipulation of the extensor tendon over the metacarpophalangeal (MCP) joint. Participants confirm that this action does not cause pain and is linked to the anatomical structure of the tendon sheath, which is less developed for the fourth and fifth digits compared to the second and third. Greg's insights highlight the mechanics of tendon movement, providing clarity on the phenomenon experienced by the original poster.

PREREQUISITES
  • Anatomy of the human hand
  • Understanding of tendon mechanics
  • Knowledge of extensor tendons
  • Familiarity with metacarpophalangeal (MCP) joints
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  • Research the anatomy and function of extensor tendons in the hand
  • Explore variations in tendon sheath development across different fingers
  • Investigate common hand movements and their anatomical implications
  • Learn about hand anatomy in relation to sports and physical activities
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Medical students, physiotherapists, hand surgeons, and anyone interested in the biomechanics of hand movements.

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Here's a video: https://www.youtube.com/watch?v=iHtIPbYK_EI

I have been able to do this for as long as I can remember, and only on my right hand.
The action that I do to trigger this thing involves pressing my 4th finger onto my palm.
Doing this doesn't hurt even if done continuously. Any ideas what this is?
 
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Looks to me like your moving the tendons from side to side over your knuckles?

hand_muscles.jpg
 
Greg is correct, you are moving your extensor tendon over your MCP joint. As you can see in Greg's picture the sheath over the 5th and 4th digit extensor tendon isn't as developed as the 2nd and 3rd digits. Yours seems to be loose enough you can move it back and fourth.
 

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