What is the first metacarpal bone associated with?

The first metacarpal bone is specifically associated with the thumb, which is also known as the pollex. It is the most lateral of the metacarpal bones in the human hand when in the anatomical position. This bone supports the thumb and plays a crucial role in various movements, allowing for opposition and gripping, which are essential for dexterity. The unique structure of the first metacarpal enables significant motion and stability, setting the thumb apart in function from the other digits.

The second digit, ring finger, and middle finger are associated with the second, fourth, and third metacarpal bones, respectively. These digits share similar anatomical features but do not directly relate to the first metacarpal, which distinctly pertains to the thumb's functionality.