Free nerve endings are specialized sensory receptors found throughout the body, particularly in the skin, mucous membranes, and connective tissues. They are responsible for detecting various sensations, including pain, temperature, and touch. Unlike other types of nerve endings, free nerve endings do not have specialized structures, allowing them to respond to a wide range of stimuli. These nerve endings play a crucial role in the body's ability to sense its environment and react to potential harm. When activated, free nerve endings send signals to the brain, which interprets these signals as sensations, helping to protect the body from injury and maintain homeostasis.