Thanks for this - I found the passage and it is talking about the palmar interossei, i.e. the ones that adduct the fingers or bring them back into contact with one another. Obviously if you have to adduct the fingers in order to get them to rotate it defeats the object - but maybe if you have really strong dorsal interossei they will hold the fingers apart against the action of the palmar interossei, which will then produce rotation only (as they do if you hold the fingers apart with your other hand while trying to pull them back together). Maybe that is what you've managed to achieve through your exercises.dtoh wrote:P.S. Per Gray's Anatomy, "Each interosseous has a considerable ability to rotate the digit at the [MCP] joint.
I'm getting in a little over my head here, but my perception is that the muscle coordination is different than the Spock sign. The Gray's articles says the muscles comes in pairs and my feeling is that you need to learn to work the two sides of the pair independently.Mr Kite wrote:At any point where there is some ability to spread the fingers, strengthening the dorsal interossei is likely to help. Since the basic action of these muscles is to abduct straight fingers, the best way to strengthen them may be to practice making the Spock sign (and variants with other finger) with elastic bands around the fingertips.
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