What type of joint is formed by the connection of phalanges?

The connection of phalanges in the fingers and toes forms a hinge joint. Hinge joints allow for movement in only one plane, which is primarily flexion and extension. This is exemplified by how the fingers bend and straighten at the joints between the phalanges.

In the case of the fingers, the joints between the phalanges (known as interphalangeal joints) can be compared to a door hinge, which can swing open or closed but does not allow for rotational movement. The specific structure of the hinge joint provides both stability and functional movement, making it essential for gripping and manipulating objects.

Other types of joints, such as ball and socket joints, are designed for a greater range of motion, including rotational movement, which is not applicable to the phalanges. Similarly, pivot joints facilitate rotational movement around an axis, primarily seen in the neck and forearm, while gliding joints allow for limited movements along the surfaces but do not provide the flexion and extension typical of hinge joints. Thus, the hinge joint is the correct classification for the connections between the phalanges.