15 modules · Core track
Each module includes a public explainer, a clinical deep-dive, claim-graded evidence, a case, a myth-buster, quiz questions, and flashcards. Switch tracks in the sidebar to unlock different layers.
Why the Vagus Nerve Matters
From brainstem to body — and why everyone is suddenly talking about it.
Anatomy of the Vagus Nerve
Brainstem nuclei, jugular foramen, branches to larynx, heart, lungs, and gut.
Autonomic Nervous System & 'Vagal Tone'
HRV, baroreflex, and why 'vagal tone' is more nuanced than wellness apps suggest.
Vagus Physiology: Afferents, Efferents, Reflexes
Why 'stimulating the vagus' is never one single intervention.
Gut-Brain Axis & Neuroimmune Signaling
The inflammatory reflex, cholinergic anti-inflammatory pathway, and where hype outruns evidence.
Non-Invasive Cervical VNS for Headache
gammaCore for migraine and cluster headache.
Transcutaneous Auricular VNS & Emerging Stimulation
Cymba conchae, sham trouble, and how to read taVNS papers.
Auricular VNS Mechanisms & Where Cymbathera Fits
From cymba to spleen: the inflammatory reflex, and how to place a new device on the evidence map.
Behavioral Autonomic Regulation
Breathing, HRV biofeedback, movement, sleep, cold — what's real, what's hype.
Peptide Signaling & the Vagus Nerve
How GLP-1, CCK, ghrelin, leptin and oxytocin talk to the brain through vagal afferents — and where the GLP-1 era reshapes the conversation.
Controversies, Myths & Polyvagal Theory
How to communicate uncertainty in a hype-saturated field.
Capstone Project
Build something that demonstrates evidence-based mastery.