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MODULE 10: The Brain
PART 3 OF 7
Among Stina’s symptoms: a heavy, pressing headache that worsens when she lies flat. Headache and intracranial pressure live in the spaces this page maps — the meninges and the CSF.
Slide 1 Transcript
PATIENT CHART
STINA
THIS PART
Ages 45
PRESENTING WITH
Brain fog, pressureThe force exerted by gases in the respiratory system, affecting airflow and gas exchange. headache
TESTS ORDERED
MRI – found white matterThe outer portion of the spinal cord made of myelinated nerve fibers that transmit signals. hyperintensities
DIAGNOSIS
Neuroinflammatory White-Matter Injury
CHART CLUES
COLLECTED AS YOU GO
Age-Excessive White Matter Hyperintensities (WMH) on Brain MRI
Childhood Recurrent Fever Traced to the Hypothalamic Set-Point
Positional Pressure Headache — Intracranial Pressure / CSF Space
An Intact BBB Should Seal the Brain — Yet the Spots Appear
Chronic IL-1β/IL-6 Loosen BBB Tight Junctions — Microglia Activate
WMH + ‘Brain Fog’ Are One Finding — Neuroinflammatory White-Matter Injury
Chart Clue #10 — the Brain as Another Target Organ
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Story1
Stina described her headaches as a fullness more than a stabbing — a pressure that built when she lay down and eased when she sat up. She assumed it was sinus or tension. But the brain is not a dry organ sitting in a box; it floats, suspended in fluid and wrapped in membranes, and pressure within those spaces has its own language. To read her headaches, students first map the cushioning system that keeps a soft brain safe inside a hard skull.
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story2
The brain is protected by three meninges(singular: meninx) – Protective membranes surrounding the spinal cord and brain.: the tough outer dura materThe thick, outermost layer of the meninges that protects the spinal cord., the web-like arachnoid materThe middle layer of the meninges, located between the dura and pia mater., and the delicate pia materThe thin, innermost layer of the meninges that closely adheres to the spinal cord. hugging the brain’s surface. Between the arachnoid and pia lies the subarachnoid space, filled with cerebrospinal fluid(CSF) – A fluid that cushions and nourishes the brain and spinal cord. (CSF). CSF is produced by the choroid plexusStructures within the ventricles that produce cerebrospinal fluid (CSF). inside the ventricles, flows from the lateral ventriclesLarge CSF-filled cavities within the cerebral hemispheres. to the third and fourth ventricles, then circulates into the subarachnoid space around the brain and spinal cordThe central nervous system structure that relays signals between the brain and body. before being reabsorbed into the blood. This fluid cushions the brain, removes waste, and keeps intracranial pressure balanced. The same cross-section also shows the brain’s two textures: gray matterThe inner portion of the spinal cord composed mostly of neuron cell bodies and synapses. (neuron cell bodies, at the cortex and deepAway from the surface of the body. nucleiClusters of neurons in the CNS responsible for processing information.) and white matter (the myelinated tractsBundles of nerve fibers in the CNS that carry signals between brain regions. beneath).
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story3
It is that white matter — the wiring — where Stina’s hyperintensities appeared, and the CSF spaces are where inflammatory signals can pool and press.
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Slide 7 Transcript
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FINDING!
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Slide 7 Transcript
NEXT PART
Cushioning protects the brain from bumps. But its most important defense isn’t padding — it’s a chemical wall built into the blood vessels themselves. Next: the blood-brain barrierA selective barrier that prevents harmful substances from entering the brain..
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All pages for Module 10 — The Brain & the Blood–Brain Barrier
10.0 Module Overview
10.1 Spots on the Scan
10.2 The Command Center
10.3 Cushions and Currents
10.4 The Wall
10.5 Breaching the Wall
10.6 White Matter Under Fire
10.7 Neuroinflammation
10.8 Conclusion and Assessment
10.9 Evidence Behind the Case
All Modules
- Anatomical Language, Membranes & Homeostasis
- Just Enough Chemistry
- The Cell & Its Transport
- Making Cells & Proteins
- The Integumentary System
- The Skeletal System
- The Muscular System
- Nervous Tissue & the Senses
- The Spinal Cord
- The Brain & the Blood–Brain Barrier
- The Autonomic Nervous System
- Special Senses (in developmentThe process of growth and differentiation.)
- The Endocrine System
- Blood
- The Heart
- Blood Vessels
- The Digestive System
- The Respiratory System
- The Urinary System
- Fluids, Electrolytes & Acid–Base Balance
- The Reproductive System
- The Immune System
List of terms
- pressure
- white matter
- meninges
- dura mater
- arachnoid mater
- pia mater
- cerebrospinal fluid
- choroid plexus
- lateral ventricles
- spinal cord
- gray matter
- deep
- nuclei
- tracts
- blood-brain barrier
- development