Which item is NOT considered a sensory structure?

• A. Tongue
• B. Nose
• C. Brain
• D. Skin

Answer: (C)

Sensory structures are the organs that detect stimuli from the environment and convert them into signals the nervous system can use. The tongue, nose, and skin each hold specialized receptors—taste buds for chemical tastes, olfactory receptors for smells, and cutaneous receptors for touch, temperature, and pain. The brain, while essential for processing and interpreting these signals, is not a sensory receptor organ itself. It functions as the processing center that integrates input from those sensory organs to create perception and coordinate responses. So, even though the brain plays a crucial role in sensation, it isn’t considered a sensory structure.