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The curve of your thumb is the part where it looks rounded, at the base of your thumb.
Thumb twitching is not normal if you thumb twitchs you may want to consult a doctor.
The metacarpels are at the base of the thumb.
overwork and fatique
yes there is a saddle joint at the base of the thumb.
it means when you bite your nails
You may be having a stroke if you have twitching lips and dizziness in the head. You should seek immediate medical attention.
to move spasmodically or convulsively; jerk; jump
Suck it..... ; )
Do you mean twitching? If so, No. Muscle doesn't jump.
what does the phrase rule of thumb mean
the hitotrolloblockem