Brain Structure and Function Study Pack
Kibin's free study pack on Brain Structure and Function includes a 6-section study guide, 25 quiz questions, 30 flashcards, and 5 open-ended Explain review questions. Sign up free to track your progress toward mastery, plus upload your own notes and recordings to create personalized study packs organized by course.
Last updated May 28, 2026
Brain Structure and Function Study Guide
Map the brain from brainstem to cortex — covering the limbic system, cerebral lobes, hemisphere lateralization, and neuroplasticity — so you can confidently explain how each structure drives behavior, memory, and cognition on your Psych 101 exam.
Key Takeaways
- •The brain is organized into three major regions — the hindbrain, midbrain, and forebrain — each responsible for distinct functional domains ranging from basic life support to complex thought.
- •The brainstem, composed of the medulla oblongata, pons, and midbrain, governs automatic vital functions such as heart rate, breathing, and reflexes without conscious effort.
- •The cerebellum coordinates voluntary movement, balance, and motor learning by continuously comparing intended movements with actual body position.
- •The limbic system, including the amygdala and hippocampus, drives emotional processing, fear responses, and the consolidation of new memories into long-term storage.
- •The cerebral cortex is divided into four lobes — frontal, parietal, temporal, and occipital — each specializing in distinct cognitive and sensory functions.
- •The two cerebral hemispheres are connected by the corpus callosum and exhibit lateralization, with the left hemisphere dominant for language in most people and the right hemisphere stronger in spatial and holistic processing.
- •Neuroplasticity allows the brain to reorganize its neural connections in response to learning, experience, or injury throughout the lifespan.
Organizational Logic of the Brain
Understanding the brain requires a map — a way of grouping its many structures by both physical location and functional role. Neuroanatomists organize the brain into three broad developmental regions: the hindbrain, midbrain, and forebrain, each of which contains distinct structures that handle increasingly complex operations.
Three-Region Developmental Framework
- •The hindbrain (rhombencephalon) sits at the base of the skull and includes the medulla oblongata, pons, and cerebellum — structures tied to survival-level functions and motor coordination.
- •The midbrain (mesencephalon) serves as a relay hub connecting the hindbrain to the forebrain and plays a key role in auditory and visual reflexes.
- •The forebrain (prosencephalon) is the largest region and contains the cerebral cortex, thalamus, hypothalamus, and limbic structures responsible for sensory processing, homeostasis, emotion, and cognition.
Gray Matter and White Matter
- •Gray matter consists of neuronal cell bodies and dendrites; it forms the outer cortex and inner nuclei where actual information processing occurs.
- •White matter consists of myelinated axon tracts that transmit signals between gray matter regions, functioning as the brain's internal communication network.
- •The ratio and integrity of white matter pathways influence how efficiently different brain regions coordinate with one another.
Brainstem and Cerebellum: Automatic Control and Motor Coordination
The brainstem and cerebellum operate largely below the level of conscious awareness, maintaining the body's baseline physiological state and ensuring smooth, accurate movement.
Medulla Oblongata
- •The medulla oblongata regulates autonomic functions that cannot safely be interrupted, including heart rate, blood pressure, breathing rhythm, and swallowing.
- •It also mediates reflexes such as vomiting and coughing, which protect the airway and gastrointestinal tract.
Pons
- •The pons relays signals between the cerebellum and the cerebral cortex, coordinating movement-related information across brain regions.
- •It also contains nuclei that regulate sleep stages and contribute to the control of facial muscles and sensation via cranial nerve pathways.
Midbrain
- •The superior colliculi in the midbrain direct reflexive eye movements toward sudden visual stimuli, while the inferior colliculi handle reflexive orienting to sounds.
- •The midbrain also contains the substantia nigra, a dopamine-producing region critical for initiating voluntary movement; its degeneration causes Parkinson's disease.
Cerebellum
- •The cerebellum receives copies of motor commands from the cortex and real-time sensory feedback from muscles and joints, then fine-tunes movement by correcting errors before they become visible.
- •It is essential for motor learning — the process by which repetitive practice turns a new physical skill into an automatic, fluid behavior.
- •Damage to the cerebellum produces ataxia, a disorder characterized by uncoordinated, jerky movements and impaired balance.
Subcortical Forebrain: The Thalamus, Hypothalamus, and Limbic System
Beneath the cerebral cortex lies a collection of structures that regulate the body's internal environment, mediate emotion, and filter sensory information before it reaches conscious awareness.
Thalamus as Sensory Gateway
- •The thalamus is a paired structure that receives almost all incoming sensory signals — except smell — and routes them to the appropriate cortical areas for processing.
- •It acts as a gatekeeper, modulating which signals reach the cortex based on attentional state, particularly suppressing sensory input during sleep.
Hypothalamus and Homeostasis
- •The hypothalamus monitors blood temperature, osmolarity, glucose levels, and hormone concentrations, triggering corrective behaviors such as hunger, thirst, sweating, and shivering.
- •It controls the pituitary gland through hormonal and neural signals, making it the master regulator of the endocrine system.
Amygdala and Emotional Processing
- •The amygdala, an almond-shaped nucleus in the temporal lobe, evaluates incoming stimuli for emotional significance, particularly threat, triggering the fear and stress response.
- •It strengthens memory consolidation for emotionally charged events by signaling the hippocampus to encode those experiences more deeply.
Hippocampus and Memory Formation
- •The hippocampus is essential for converting short-term experiences into long-term declarative memories — the type of memories that can be consciously recalled as facts or events.
- •Bilateral hippocampal damage, as in the famous patient H.M., prevents the formation of new long-term memories while leaving older memories and procedural skills intact.
Basal Ganglia and Action Selection
- •The basal ganglia are a group of subcortical nuclei that select which motor programs to execute and which to suppress, effectively filtering movement impulses from the cortex.
- •Dysfunction in basal ganglia circuits underlies both Parkinson's disease (too much suppression, producing rigidity) and Huntington's disease (too little suppression, producing involuntary movements).
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About this Study Pack
Created by Kibin to help students review key concepts, prepare for exams, and study more effectively. This Study Pack was checked for accuracy and curriculum alignment using authoritative educational sources. See sources below.
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Which three structures make up the brainstem?
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Brain Regional Organization (Hindbrain, Midbrain, Forebrain)
Explain how the brain is divided into its three major developmental regions in your own words. What structures belong to each region, and how do their functions differ from one another?
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