kitarist -> RE: Tip joint in arpeggio (Apr. 15 2020 19:40:21)
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quote:
Generally, as I understand it, flexion at a joint involves the angle getting smaller, and extension the angle getting bigger, but I think there are some exceptions (can't think what at mo) Yes, but for less ambiguity flexing/flexion is defined as when the angle between a segment and a proximal segment decreases (proximal = closer to the trunk than the other segment). This takes care of almost all potential ambiguity, except when you have joints that can move in opposite directions. Then it has to be added that in such cases, as with shoulder joint or neck joint, flexion is when the movement is towards the front (anterior) of the body in the anatomical position. So curling the tip of a finger towards the inside of the palm is flexion, even though one might say "well, the angle between tip and middle finger segments as measured from the back side is increasing, so why would it be flexion instead of extension?" - because the anterior of the body is primary when forming the angles. In the anatomical position, the open hands are facing the front/anterior, so the angle wold be defined on the anterior side of the finger, which is the palm side.
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