Ruffini endings are specialized sensory receptors found in the skin and joint tissues. They are responsible for detecting skin stretch and the position of joints, contributing to our sense of proprioception. These receptors are slow-adapting, meaning they continue to respond to a stimulus over time, providing continuous feedback about the state of the skin and joints. Located deep within the dermis, Ruffini endings are elongated and spindle-shaped, allowing them to respond to sustained pressure and tension. They play a crucial role in helping the body perceive changes in movement and position, which is essential for coordination and balance during physical activities.