Time To Read
Date Last Modified
Nervous Tissue & the Senses · Chapter 7 of 7
Six findings, one nerve chart. Read together they refuse the tidy story. The last question is the hardest: is this her lifelong inflammation reaching the nerves, or a second disease sitting beside it?
The question you will answer
Is Stina’s neuropathy part of her lifelong inflammatory story — or a separate disease that happens to sit beside it?
About 45 minutes. Work the steps in order.
Animation · in production · 1 min 40 s
The Chart, Read Whole
Six finding cards slide onto a timeline around the crash date. The stripe peels off to the left: one root, the crash. The rest stack up on the right: stockings, large fibers, slowed conductionThe transmission of nerve impulses along neurons., a working synapseThe junction between two neurons where communication occurs., anti-MAG.
Watch the opener first. It sets the question; the chapter answers it.
1
Read the chart
Patient chart · Stina
age 35 onward · the nerve problem list
| Findings so far | Two patterns; symmetric large-fiber loss; slowed conduction; synapse intact; anti-MAG IgM; two maps (an L5 band and stockings). |
|---|---|
| Background | Recurrent fevers since age two, with high inflammatory markers; no name for them yet. |
| Antibody | Anti-MAG, IgM class, high titer. |
| Not on the chart | A serum protein electrophoresis. |
| The clinic’s summary | “Pinched nerve from the accident.” |
This chapter writes line 7 of Chart Clue #8.
Your prediction
Part of her lifelong inflammation, or a second disease beside it? Open the one you’d bet on — nothing is graded, and the answer isn’t here; the scenes will test your bet.
Part of her lifelong inflammation
You’re betting on one system. Fair: she has run inflammatory fevers since age two, and inflammatory cytokines can reach nerves. In Scenes 3 and 4, weigh how strong the evidence for that route is — and where it was gathered.
A separate disease beside it
You’re betting on two problems. Fair: an antibody aimed at one nerve protein is a very specific target for a general inflammation to hit. In Scene 2, find out where anti-MAG antibodies usually come from — and in Scene 4, ask what the FMF studies did and didn’t find.
Both — connected, but not the same process
You’re betting on a link without a merger. Fair: one immune problem might set the stage for another without being the same disease. In Scene 4, look for any study that joins the two — and in Scene 3, decide how much a lab mechanism can carry.
Can’t say yet — I’d need to know…
A fair place to stand. Decide what you’d need first — where the antibody comes from? a study of FMF patients? a blood test? — and look for it in Scenes 2 and 4.
From Stina’s diary
“I teach biology. I know what a system looks like when I see one, and this looks like a system.”
2
The story
Three short movements. Read them once now; each links to the scene where you’ll see it move.
I · A One-Sided Crash Can’t Explain This
Put Stina’s nerve story on one page. A year of symmetric foot numbness she explained away. A crash that seemed to start everything. Conduction studies showing not a severed wire but a slow one, slowest at the far ends. Sensory loss far outrunning weakness, a synapse that works, two maps on one pair of legs, and antibodies against MAG. Each finding alone earned a shrug, and the crash gave everyone a tidy story to stop at. Lined up, they refuse it.
See it move: Scene 1 · Before and After: Line Up the Chart
II · Where an Antibody Comes From
Antibodies are made by plasma cellsImmune cells that develop from B cells and produce antibodies., each descended from one B cell and each making one antibody. Chronic inflammation usually raises antibodies across the board, many clones at once. Anti-MAG antibodies are different: in most patients they are IgM made by a single expanded clone, which shows up in the blood as a narrow spike. Meanwhile the cytokines that drive Stina’s fevers, IL-1β and IL-6, can act on Schwann cellsPNS glial cells that form the myelin sheath around peripheral nerve fibers. and sensory nervesNerves that carry signals from sensory receptors to the CNS.. Two routes to a damaged nerve — and they are not the same route.
See it move: Scene 2 · Plasma Cells, Clones and IgM · Scene 3 · IL-1β at the Schwann Cell
III · One System, or Two?
Stina’s own words are “this looks like a system.” This module’s evidence page is candid: anti-MAG neuropathy is real, and its link to FMF is not established. Your verdict here is a real one. Weigh how strong each piece of evidence is, not just which way it points.
See it move: Scene 4 · What the FMF Literature Shows · Scene 5 · Chart Clue #8
3
Watch · explore · think · check
Five scenes. Each one has a short animation or a slide, something to explore, a true/false spot-check of your thinking, and a quick check. Every scene gives you an evidence card for your board.
How to read the scenes
- Animation (dark teal) — a short animated explainer, one idea each
- Slide (dark teal) — a still to study: a micrograph or a map
- Explore (purple) — something to push on while you watch
- Game (purple) — a quick challenge
- Think (gold) — reason it out, then spot-check yourself with a few true/false questions; not graded
- Check (gold) — a quick H5P that scores itself
Scene 1 of 5
Before and After: Line Up the Chart
Put every finding on the timeline and see which side of the crash it falls on.
Animation · in production · 1 min
Before the Crash, After the Crash
A timeline with the crash date in the middle. Findings drop onto it: numb feet a year before; the stripe two days after; the exam, the nerve study and the antibody months later.
Explore
Chart Assembler
Drag each finding to where it belongs on Stina’s timeline: already there before the crash, or first recorded after it.
Think · not graded
Which single finding would you show a skeptic to prove the neuropathy isn’t from the crash — and why that one rather than the others?
Spot-check your thinking: true or false?
Check · Sort the Paragraphs
Put Stina’s nerve findings in the order Chapters 1 to 6 uncovered them.
Evidence card 1
Add it to your evidence board
The neuropathy began before the crash and follows nerve length.
Scene 2 of 5
Plasma Cells, Clones and IgM
Tell a broad inflammatory rise in antibodies from a single-clone spike.
Animation · in production · 1 min 50 s
One Clone, One Antibody
Many B-cell clones respond to an infection; many different antibodies; a broad hill on a protein electrophoresis. One clone expands on its own and makes one antibody over and over — a narrow spike.
Explore
Electrophoresis Reader
Sort each protein electrophoresis trace or situation into the pattern it shows, then notice where most anti-MAG patients land.
Think · not graded
Chronic inflammation raises many antibodies at once; anti-MAG antibodies usually come from a single clone. Which verdict does that fit better — and what blood test would you order next to find out?
Spot-check your thinking: true or false?
Check · Multiple Choice
Which electrophoresis pattern points to a single clone — and why does that matter for anti-MAG?
Evidence card 2
Add it to your evidence board
Anti-MAG antibodies usually come from a single clone — an IgM spike.
Scene 3 of 5
IL-1β at the Schwann Cell
Follow her inflammatory cytokines to the nerve — and label the evidence fairly.
Animation · in production · 1 min 30 s
Cytokines Reach the Nerve
IL-1β and IL-6 pour out during a fever attack and circulate. At a peripheral nerve they loosen the blood–nerve barrier and call in macrophages. In lab and animal studies of nerve injury, IL-1β pushes Schwann cellsThe basic structural and functional units of life. to strip their myelin and revert to a repair state.
Explore
Weigh It
Sort each claim by the evidence behind it: textbook physiologyThe study of how the body functions., studies of FMF patients, or not established.
Think · not graded
The evidence that IL-1β changes Schwann cells comes from lab and animal studies of nerve injury, not from FMF patients. How much weight should it carry in your verdict — and what study would settle the question?
Spot-check your thinking: true or false?
Check · Summary
In each set, choose the statement that matches the strength of the evidence behind it.
Evidence card 3
Add it to your evidence board
IL-1β drives Schwann-cell changes in lab and animal studies.
Scene 4 of 5
What the FMF Literature Shows
Read what studies of FMF patients actually found — and what they didn’t.
Slide · a still to study
What FMF Studies Show — and Don’t
What studies of FMF patients can and can’t tell you about Stina, with the strength of each.
- Seen in FMF patients (cohort): nerve changes on testing, often before any symptomsSubjective experiences reported by the patient (e.g., nausea, fatigue)..
- Seen in FMF patients (cohort): an association with demyelinating disease, including multiple sclerosis.
- Textbook physiology: IL-1β can change Schwann cells and loosen myelin — shown in lab and animal work, not in FMF.
- Not established: any link between FMF and anti-MAG antibodies.
Explore
Read the Evidence
Five quick calls about what a study of FMF patients can and can’t tell you about Stina.
Think · not graded
The literature links FMF to nerve involvement and to demyelinating disease, but no study links FMF to anti-MAG. Which verdict does that support — part of FMF, separate, or both? What is the strongest objection to your choice?
Spot-check your thinking: true or false?
Check · Multiple Choice
Which conclusion does the FMF nerve literature actually support?
Evidence card 4
Add it to your evidence board
FMF cohorts show subclinical nerve changes and a link to demyelination.
Scene 5 of 5
Chart Clue #8
Decide what the clue should say, then add it to the running timeline.
Animation · in production · 1 min
Clue #8 Joins the Timeline
The running timeline scrolls from Clue #1 at age two. Clue #8 lands at 2010, age thirty-five. A dotted line runs forward to 2015 with a question mark — the Blood module.
Explore
Running Timeline
Put six moments from Stina’s life in order and see where Clue #8 lands.
Think · not graded
Decide what one sentence Clue #8 should say. Then spot-check your thinking below, and compare your sentence with the finding at the end of this page.
Spot-check your thinking: true or false?
Check · Summary
Choose the statement that holds in each set, and watch Chart Clue #8 come together.
Evidence card 5
Add it to your evidence board
Having one immune problem doesn’t rule out a second.
4
Your evidence board
Every scene gave you an evidence card, and the chart and the evidence page add two more. Drag each card to the reading it supports — some can go in more than one place, and the feedback tells you which cards decide the case.
5
Your verdict
Time to decide. Build your verdict from statements that hold up — no writing needed. At the end you’ll see your whole argument in one place.
Look back at your prediction
If you bet on part of her lifelong inflammation
Your bet had real support: decades of inflammatory fevers, FMF cohorts with subclinical nerve changes, and a cytokine that alters Schwann cells in the lab. What holds it back is strength, not direction — the mechanism comes from lab and animal work, and no study links FMF to anti-MAG. Plausible is as far as the evidence goes.
If you bet on a separate disease
Your bet rests on the strongest single card: anti-MAG usually comes from one clone of plasmaThe liquid component of blood. cells, not from a broad inflammatory rise. Check that you held it at the right strength. Stina’s chart has no electrophoresis yet, so the clone is a lead, not a finding.
If you bet on both
You kept apart two ideas that are easy to merge: a second process with a source of its own, in a body with decades of immune activation. That is a defensible reading, as long as you can say which half rests on firm evidence and which half is still a guess.
If you said you couldn’t say yet
That was a fair call, and the chapter backs it more than you might expect. You now know what would move the question: a protein electrophoresis to look for a single clone, and studies that test FMF patients for anti-MAG. The Blood module runs the first one on Stina.
6
The finding
Added to Stina’s chart · Chart Clue #8, line 7 of 7
Chart Clue #8 · an antibody-associated neuropathy, present before the crash
Read together, the nerve chart is one disease plus one injury: a symmetric, length-dependent, sensory-predominant demyelinating neuropathy with anti-MAG IgM antibodies, present a year before the crash — and, separately, an L5 root irritated on the left. The crash can claim the stripe. It can’t claim the stockings. Whether her lifelong inflammation made the antibody is unproven; anti-MAG’s usual single-clone source points to a second process, and the Blood module will look for it.
Next · Conclusion
Conclusion and Assessment
Seven verdicts built. Lay the nerve chart end to end, give the module verdict, and log Chart Clue #8.
Reliable information on rare diseases
NORD · NIH GARD · Orphanet · MedlinePlus Genetics: FMF · FMF & AID Global Association · Autoinflammatory Alliance · Global Genes · Amyloidosis Foundation
Stina has one rare disease. In the United States, about 1 in 10 people live with one of the more than 7,000 known rare diseases. These organizations are where patients, families and clinicians go for trustworthy information.
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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
- conduction
- synapse
- plasma cells
- Schwann cells
- sensory nerves
- cells
- physiology
- symptoms
- plasma
- development