Brain Anatomy and Neuroscience Quiz

When a neuron's cell body dies, the entire neuron dies because the cell body contains the nucleus and metabolic machinery essential for survival. Axons and dendrites cannot function independently without the cell body. Neurons cannot regenerate or send messages to create new cells.

Sensory neurons transmit signals from sensory receptors in the body (skin, muscles, organs) toward the central nervous system (brain and spinal cord). This is the correct direction of information flow. Option A describes motor neurons, and Option D describes interneurons.

The cerebrum is the largest part of the human brain, accounting for about 85% of the brain's weight. It controls higher functions like thought, memory, reasoning, and sensory processing. The cerebellum coordinates movement, while the brain stem regulates basic life functions.

Parkinson's disease primarily affects the midbrain, specifically the substantia nigra region where dopamine-producing neurons degenerate. The midbrain is part of the brain stem. Dopamine deficiency from this degeneration causes the characteristic motor symptoms of Parkinson's.

Gyri are the raised folds or ridges on the surface of the cerebral cortex. Sulci are the grooves or depressions between the gyri, while lobes are large functional divisions of the brain. The corpus callosum is the bundle of nerve fibers connecting the hemispheres.

The parietal lobe processes somatosensory information including touch, pain, temperature, and proprioception. The primary somatosensory cortex is located in the postcentral gyrus of the parietal lobe, with sensory information mapped topographically across this area.

The interhemispheric fissure (also called the longitudinal fissure) is the deep groove that separates the right and left cerebral hemispheres. The corpus callosum runs beneath this fissure, connecting the hemispheres, but the fissure itself is the visible separation when viewing the brain from above.

The cerebellum receives input from all other parts of the brain, the spinal cord, and sensory systems to coordinate voluntary movements, maintain balance, and posture. It integrates motor information to fine-tune movement rather than initiating it.

The cerebellum receives sensory input from other brain regions and spinal cord to fine-tune voluntary movements, balance, and posture. It coordinates motor commands but doesn't initiate them. The brain stem controls basic functions, sulci are grooves, and corpus callosum connects hemispheres.

Blue is scientifically documented to have a calming psychological effect on humans and can trigger the release of calming hormones. This is why blue is often used in bedrooms, hospitals, and spaces designed for relaxation.