The brainstem is a continuation of the spinal cord in the rostral direction. The conditional border between them is the place where the first cervical roots emerge and the pyramidal decussation. The brainstem is divided into the hindbrain and midbrain. The first includes the medulla oblongata, the pons, and the cerebellum. Its continuation is the midbrain, consisting of the quadrigeminal bodies and cerebral peduncles and bordering the diencephalon (thalamus, hypothalamus, subthalamus).