Neuroanatomy Cheat Sheet

The core ideas of Neuroanatomy distilled into a single, scannable reference — perfect for review or quick lookup.

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Quick Reference

Cerebral Cortex

The outermost layer of the cerebrum, composed of gray matter organized into six histological layers. It is responsible for higher cognitive functions including perception, voluntary movement, language, reasoning, and consciousness.

Brainstem

The posterior part of the brain connecting the cerebrum to the spinal cord, comprising the midbrain, pons, and medulla oblongata. It contains cranial nerve nuclei, ascending and descending tracts, and vital autonomic centers controlling breathing, heart rate, and consciousness.

Limbic System

A set of interconnected structures located on the medial aspect of the cerebral hemispheres, including the hippocampus, amygdala, cingulate gyrus, and hypothalamus. It plays critical roles in emotion, memory formation, motivation, and autonomic regulation.

White Matter Tracts

Bundles of myelinated axons that connect different regions of the central nervous system. They are classified as projection fibers (connecting cortex to subcortical structures), commissural fibers (connecting the two hemispheres), or association fibers (connecting regions within the same hemisphere).

Basal Ganglia

A group of subcortical nuclei including the caudate nucleus, putamen, globus pallidus, subthalamic nucleus, and substantia nigra. They form circuits with the cortex and thalamus that modulate voluntary movement, procedural learning, and reward-based behavior.

Cranial Nerves

Twelve pairs of nerves that emerge directly from the brain or brainstem, each with specific sensory, motor, or mixed functions. They innervate structures of the head and neck, with the vagus nerve (CN X) extending to thoracic and abdominal viscera.

Cerebrovascular Supply

The arterial system supplying the brain, derived from the internal carotid arteries (anterior circulation) and vertebral arteries (posterior circulation), which anastomose at the Circle of Willis at the base of the brain.

Spinal Cord Organization

The spinal cord is organized into 31 segments (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal), with gray matter centrally forming an H-shape containing neuronal cell bodies, and surrounding white matter containing ascending sensory and descending motor tracts.

Thalamus

A large ovoid mass of gray matter forming the bulk of the diencephalon, serving as the principal relay station for sensory information (except olfaction) traveling to the cerebral cortex. It contains numerous nuclei with specific cortical projection targets.

Meninges and Cerebrospinal Fluid

The brain and spinal cord are enveloped by three protective membranes (dura mater, arachnoid mater, pia mater) and bathed in cerebrospinal fluid (CSF), which is produced by the choroid plexus in the ventricles and circulates through the ventricular system and subarachnoid space.

Key Terms at a Glance

Afferent:Nerve fibers or pathways that carry sensory information toward the central nervous system (from periphery to brain/spinal cord).

Basal Ganglia:A group of subcortical nuclei (caudate, putamen, globus pallidus, subthalamic nucleus, substantia nigra) involved in modulating voluntary movement, procedural learning, and reward.

Blood-Brain Barrier:A selective barrier formed by tight junctions of brain capillary endothelial cells that restricts passage of substances from the blood into the brain parenchyma.

Brainstem:The portion of the brain comprising the midbrain, pons, and medulla oblongata, connecting the cerebrum to the spinal cord and containing cranial nerve nuclei and vital centers.

Brodmann Areas:A system of numbered cortical regions defined by cytoarchitectural differences, used to map functional areas of the cerebral cortex (e.g., area 4 = primary motor cortex, area 17 = primary visual cortex).

Cerebellum:A structure in the posterior fossa responsible for coordination of voluntary movement, balance, equilibrium, and motor learning.

Cerebral Cortex:The outer layer of gray matter of the cerebrum, organized into six layers, responsible for higher cognitive functions including perception, motor control, language, and thought.

Cerebrospinal Fluid:A clear, colorless fluid produced by the choroid plexus that fills the ventricles and subarachnoid space, providing mechanical protection, buoyancy, and waste removal for the brain and spinal cord.

Circle of Willis:An arterial anastomotic ring at the base of the brain connecting the anterior and posterior cerebral circulations, providing collateral blood flow.

Corpus Callosum:The largest white matter commissure connecting the two cerebral hemispheres, allowing interhemispheric communication.

Cranial Nerves:Twelve pairs of nerves that arise directly from the brain or brainstem, providing motor, sensory, and autonomic innervation primarily to the head and neck.

Decussation:The crossing of nerve fibers from one side of the central nervous system to the other, as seen in the pyramidal decussation of the corticospinal tract in the medulla.

Diencephalon:The part of the brain between the cerebral hemispheres and the midbrain, comprising the thalamus, hypothalamus, epithalamus, and subthalamus.

Efferent:Nerve fibers or pathways that carry motor commands away from the central nervous system toward muscles and glands.

Gray Matter:Neural tissue composed primarily of neuronal cell bodies, dendrites, unmyelinated axons, and synapses. Found in the cerebral cortex, deep nuclei, and central spinal cord.

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