Neuroanatomy

The corpus callosum is a commissural fibre tract of roughly 200 million axons connecting the two cerebral hemispheres of the placental mammalian brain, enabling interhemispheric transfer of sensory, motor, and cognitive information. It is the largest white-matter structure in the brain.

The locus coeruleus (LC) is a compact, bilateral nucleus of noradrenergic neurons located in the pons of the brainstem. It is a major source of norepinephrine in the brain and is functionally associated with the ascending reticular activating system, especially through its role in arousal, wakefulness, attention, and stress responses.

Four interconnected cavities, deep inside the brain, that produce and circulate cerebrospinal fluid.

The brain's wiring: bundles of myelinated axons that move information between regions at speed.