The inner regions of the brain closer to incoming blood flow (pons/medulla, thalamus ... compared to outer brain regions (cerebellum, striatum, and frontal, occipital, and temporal cortices).

the cerebellum enables the body to maintain balance and posture. The brain stem, situated at the bottom of the brain, is made up of three main parts: the midbrain, pons, and medulla oblongata.

Brainstem regions of interest (ROIs) included the midbrain, medulla, superior cerebellar peduncle (SCP), and pons. Mean susceptibility per ROI was extracted and used for subsequent analyses.