A pollex is the anatomical term for the thumb. It is the first digit of the hand and is opposable to the other four fingers, allowing humans to grasp and manipulate objects with precision. The pollex has two phalanges (bone segments) and is controlled by a complex set of muscles and tendons, enabling a wide range of movements.
The thumb plays a crucial role in many daily activities, from holding a pen to using a smartphone. Its unique structure and flexibility are key to the dexterity that sets humans apart from many other species.