The internal capsule is a bundle of fibers that passes through the basal ganglia and connects the cerebral cortex with lower brain structures. It is divided into the anterior limb, genu, posterior limb, retrolenticular part, and sublenticular part. The internal capsule contains thalamocortical fibers, corticopontine fibers, corticonuclear fibers, and corticospinal fibers. It receives its blood supply from the lenticulostriate arteries of the middle cerebral artery, the anterior cerebral artery, and the anterior choroidal artery. Damage to specific parts of the internal capsule can cause motor or sensory deficits on the opposite side of the body.