Brain stem

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The brain stem is a part of the brain that consists of the midbrain, pons, and medulla oblongata in descending order of the neuroaxis. Descending tracts (e.g., the corticobulbar and corticospinal tracts) travel from the internal capsule to the brain stem (as with the corticobulbar tracts) or through it (corticospinal tract). Ascending tracts carrying afferent information to the cortex pass from or through the brain stem to the thalamus.

Components are connected by cerebellar peduncles.

The brain stem can be simply examined by looking at light reflexes or conjugated movements of the eye.