In the diagram,what structure is filled with mostly interstitial fluid? 
Definitions:
Locomotion
The ability to move around on one’s own.
Prefrontal Cortex
The front part of the frontal lobe of the brain, involved in complex behaviors such as decision making, planning, and regulating social behavior.
Integrating Information
The process of synthesizing and combining various pieces of data, knowledge, or insight to form a cohesive understanding or conclusion.
Prefrontal Cortex
A region of the brain located at the front of the frontal lobe, crucial for decision making, cognitive behavior, personality expression, and moderating social behavior.
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