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The Central Nervous System: Anatomy, Functions, and Control of Body Processes

The central nervous system (CNS) comprises the brain and spinal cord. It is the body's command center, integrating sensory input, coordinating motor output, and regulating cognition, emotion, and homeostasis.

Brain: The Control Hub

StructureKey Functions
Cerebrum (cerebral cortex)Voluntary movement, sensory perception, language, reasoning, memory, emotion, consciousness
CerebellumCoordination, balance, posture, motor learning, precision timing
Brainstem (midbrain, pons, medulla)Vital autonomic functions: breathing, heart rate, blood pressure, sleep-wake cycles, cranial nerve nuclei
Diencephalon (thalamus, hypothalamus)Sensory relay, endocrine regulation (pituitary), temperature, hunger, thirst, circadian rhythms
Limbic SystemEmotion, motivation, memory formation, olfaction

Spinal Cord: The Information Highway

  • Extends from foramen magnum to L1–L2 (conus medullaris)
  • Ascending tracts: Carry sensory information (touch, pain, temperature, proprioception) to the brain
  • Descending tracts: Carry motor commands from brain to spinal motor neurons
  • Reflex Arcs: Local circuits for rapid, involuntary responses (e.g., withdrawal reflex) without brain involvement
  • 31 pairs of spinal nerves (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal) connect CNS to periphery

CNS Protection

  • Bony: Skull (cranium) and vertebral column
  • Meninges: Dura mater, arachnoid, pia mater
  • CSF: Cerebrospinal fluid cushions, nourishes, removes waste
  • Blood-Brain Barrier: Selective permeability protects neural tissue from toxins/pathogens

CNS vs. Peripheral Nervous System (PNS)

  • CNS: Brain + spinal cord; integration and command
  • PNS: Cranial/spinal nerves + ganglia; communication between CNS and body
  • Autonomic NS (ANS): Part of PNS; involuntary control (sympathetic/parasympathetic/enteric)

Clinical Relevance

CNS disorders include stroke, traumatic brain injury, multiple sclerosis, Parkinson's, Alzheimer's, epilepsy, tumors, infections (meningitis, encephalitis), and developmental disorders. Early recognition of CNS signs (altered consciousness, focal deficits, seizures, cognitive change) is critical for timely intervention.

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