Brain Structures: Hindbrain Components

Medulla

• Located where the spinal cord enters the skull.
• Controls vital functions such as breathing and heart rate.
• Regulates reflexes.

Cerebellum

• Extends from the rear of the hindbrain, just above the medulla; consists of two rounded structures.
• Plays important roles in motor coordination (e.g., leg and arm movements, playing golf, practicing the piano, learning to dance).
• Integrates muscular activities required for tasks like writing.
• Damage impairs coordinated movements, leading to awkward and jerky motions; extensive damage prevents standing.
• Also has a role in social thinking and social behavior, such as mimicry.

Pons

• A bridge in the hindbrain connecting the cerebellum and the brain stem.
• Contains clusters of fibers involved in sleep and arousal.

Brain Stem

• Includes much of the hindbrain (excluding the cerebellum) and the midbrain.
• Connects at its lower end with the spinal cord and extends upward to encase the reticular formation.
• The most ancient part of the brain, evolved over $500$ million years ago.
• Clumps of cells determine alertness and regulate basic survival functions such as breathing, heartbeat, and blood pressure.