Collapse: Neurological

Status: Reserved slug — full retrograde essay in development.

This is the second panel of the Terminal Event Diptych.

The Retrograde Chain

Cognitive decline → Neuronal loss → Neuroinflammation →
Microglial activation → Blood-brain barrier compromise →
Circulating bEVs → Periodontal pocket

Key Mechanisms (to be developed)

• bEV transcytosis across brain endothelium
• Gingipain-mediated tau phosphorylation
• LPS-driven microglial priming via TLR4
• NLRP3 inflammasome–dependent IL-1β release in hippocampal tissue
• bEV-nucleated protein aggregation at amyloid-periodontal interface

Pedagogical Method

Terminal Event Pedagogy — start with the

family noticing word-finding difficulty, work backward. The clinician already

knows what Alzheimer's is. They need to see the path from pocket to

hippocampus.

The Diptych Argument

This essay pairs with Collapse: Cardiovascular.

Same mechanism, different organ system. The conservation of the

bEV cascade across cardiovascular and neurological

endpoints is the argument — not two diseases, one transport program.

Corpus References

• bEV Cascade — the five-step conserved program
• OVN Nexus — the organizing thesis
• Terminal Event Pedagogy — the teaching method
• Network Medicine, Mouth Outward — the topological framework
• IT-from-Qubit — same signal, different tissue interpretation

*Full essay to be authored by S. Thaddeus Connelly. This stub reserves the

canonical URI and establishes the structural outline.*