Brainstem systems

Brainstem centers are organized into medial, lateral, and aminergic systems. Collectively, these integrate vestibular, visual, and somatosensory inputs for the control of eye movements and, through projections to the spinal cord, provide for postural adjustments. For example, these centers keep the images on matching regions of the retinas when the head moves by causing conjugate eye movements in the opposite direction to which the head is turned. This is the basis for the 'doll's eyes' test in clinical neurology in which the head is rapidly turned and the eyes move conjugately in the opposite direction, demonstrating the integrity of much of the brainstem.

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