This document summarizes key aspects of smell, taste, and touch in the nervous system. It explains that smell involves organic molecules binding to olfactory receptors in the nose, and smell has a strong connection to emotion and memory. Taste similarly involves molecules binding to receptors on taste buds on the tongue. The tongue contains receptors for sweet, sour, salty, and bitter tastes in different regions. Touch is sensed by various pressure and temperature receptors in the skin like Meissner's corpuscles and Pacinian corpuscles that detect pressure and vibration. Nociceptors sense pain while thermoreceptors detect temperature changes.