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Description

The trapezium bone is the "saddle seat" of the first metacarpal (the part of the thumb that's inside the hand). It's a bone partially responsible for the thumb's opposable motion.
We can see or feel it, if we rotate our thumbs in a circular motion.
Study some xray images of hands while you do this. Look back at the joints on your own hands. Draw what you learn until it's second nature.

Description

The trapezium bone is the "saddle seat" of the first metacarpal (the part of the thumb that's inside the hand). It's a bone partially responsible for the thumb's opposable motion.
We can see or feel it, if we rotate our thumbs in a circular motion.
Study some xray images of hands while you do this. Look back at the joints on your own hands. Draw what you learn until it's second nature.