| 1. | It is inserted onto the radial side of the first metacarpal.
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| 2. | The first metacarpal has a broadly expanding contact surface with the second metacarpal.
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| 3. | Both involve a less developed first metacarpal and a nearly absent thenar musculature.
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| 4. | The left first metacarpal is very short :.
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| 5. | As the lower joint of the first metacarpal is bevelled, the thumb diverges medially.
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| 6. | Pronation-supination of the first metacarpal is especially important for the action of opposition.
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| 7. | "Rapator " was described by Huene for a first metacarpal from Australia.
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| 8. | Unlike titanosaurs, the olecranon was absent, and the first metacarpal was not bowed.
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| 9. | This remains true regardless of how the first metacarpal bone is being rotated during opposition and reposition.
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| 10. | The break _ at the base of the first metacarpal bone _ was discovered by X-rays.
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