Downward Thumb Rotation

When the thumb is extended and lying close to the line of the index finger, the maximum elevation it can achieve here is a position just barely above the level of the palm, The upper sketch demonstrates this limitation, As the thumb rotates downward, it will cross the index finger boundary at At As it slips past, the thumbnail angle will be past the 90-degjee vertical to 100 and 120 degrees <sec thumb at B >. In these extreme positions. the thumb will go into Opposition to all the fingers. If the long fingers close in toward ihe palm at this phase of thumb opposition {see bottom sketch), the fingertips make direct contact with the thumb up.

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