The olfactory epithelium is a specialized tissue located in the nasal cavity that plays a crucial role in the sense of smell. It contains sensory neurons that detect odor molecules in the air. When these molecules bind to receptors on the neurons, they send signals to the brain, allowing us to perceive different scents. This epithelium is composed of three main cell types: sensory neurons, supporting cells, and basal cells. The sensory neurons have cilia that extend into the nasal cavity, increasing their ability to capture odorants. The olfactory bulb, located at the base of the brain, processes the signals received from the olfactory epithelium.