Questions: The two functional brain systems which are composed of structures that are scattered throughout the brain are the formation and the system.

The two functional brain systems which are composed of structures that are scattered throughout the brain are the reticular formation and the limbic system.

Explanation:

• The reticular formation is a network of neurons located throughout the brainstem that is involved in various functions, including regulating sleep-wake cycles and filtering incoming stimuli to discriminate irrelevant background stimuli.
• The limbic system is a complex set of structures located on both sides of the thalamus, just under the cerebrum. It is involved in emotions, behavior, motivation, long-term memory, and olfaction. The limbic system includes structures such as the hippocampus, amygdala, and hypothalamus.

These systems are not confined to a single, localized area but are instead distributed across various parts of the brain, which is why they are described as being composed of scattered structures.