What structure divides the cerebrum into two parts?

The structure that divides the cerebrum into two parts is the corpus callosum. The corpus callosum is a thick band of nerve fibers that connects the left and right hemispheres of the brain, facilitating communication between them. This structure is crucial for coordinating functions between the two sides of the brain, including higher cognitive functions, motor control, and sensory information processing.

The other options listed serve different functions within the brain. The hippocampus is primarily involved in memory formation and spatial navigation. The cerebellum is mainly responsible for coordination and balance, as well as fine-tuning voluntary movements. The amygdala plays a key role in emotion regulation and the processing of emotional responses. Each of these structures has its unique roles, but it is the corpus callosum that specifically serves to separate and connect the two hemispheres of the cerebrum.