Suction Disks; Anatomy and Function

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While handling my GPO this afternoon I noticed that there is a small hole at the center of each suction disk. When I touch the disks, what appears to be a valve like disk below the hole pulls inwards, allowing the hole to open up. I took a rough picture of it but I can't post it right now. I would've taken a video for better clarity but it was hard enough to get the picture. I think I have an idea as to the purpose of this hole, but could anyone tell me more about it and its function?
 

Nancy

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You're fortunate to be able to care for a GPO. Does it interact much? Some of them seem to.

Nancy
 

Green_Tree

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If i understood what you were describing correctly, as a valve-like disc below the hole pulling away from the hole when it wants to attach. Then it sounds to me like a plausible hypothesis for how exactly they are able to create suction on the arms so freely. But once again this is just my guess by what I think you were describing so i could be completely wrong.
 

tonmo

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Fwiw, that's what I thought too. Makes sense to me.

What would be interesting would be to discern voluntary vs involuntary movement, which in itself has its own meaning when it comes to octopuses.
 

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