Which of the following is NOT one of the five sensory organs of the nervous system?

The brain is indeed not classified as one of the five sensory organs of the nervous system. The primary sensory organs include the eyes, ears, skin, nose, and tongue, which are responsible for processing sensory information such as vision, hearing, touch, smell, and taste.

While the brain plays a critical role in interpreting signals received from these sensory organs, it does not serve as a sensory organ itself. Instead, the brain processes and integrates sensory data to form perceptions and generate responses. This distinction is essential in understanding the anatomy and function of the sensory system.