OMM Review — Viscerosomatics and Autonomics
Original OMM review notes for viscerosomatic reflex levels, autonomic innervation, and Chapman points.
Autonomic Innervation by Gut Region
Sympathetic outflow and parasympathetic input are organized by embryological gut region. Foregut structures receive sympathetic fibers from T5-T9 and parasympathetics via the vagus. Midgut uses T9-T12 sympathetics and vagus parasympathetics. Hindgut and pelvic organs use L1-L2 sympathetics and S2-S4 parasympathetics.
| Region | Sympathetic | Parasympathetic |
|---|---|---|
| Foregut | T5–T9 | CN X (vagus) |
| Midgut | T9–T12 | CN X (vagus) |
| Hindgut | L1–L2 | S2–S4 |
| Pelvic organs | L1–L2 / T10–L2 | S2–S4 |
Viscerosomatic Reflex
Afferent input from a diseased organ produces segmental facilitation, leading to tissue texture changes, tenderness, and asymmetry in the associated somatic tissues. The classic example is T5-T9 tenderness with myocardial ischemia or T10 referred pain from appendicitis.
Remember the vagus nerve serves foregut and midgut until the distal transverse colon; everything distal is served by pelvic splanchnics from S2–S4.
Chapman Points Overview
Chapman points are palpable, small, deep, alden/rubbery points found anteriorly and posteriorly. They are associated with specific organs and can guide diagnosis. Treatment uses gentle rotary pressure or fascial release over the point.
Gallbladder: right anterior 6th ICS Pancreas: left anterior 6th ICS Appendix: McBurney area anterior / posterior lumbar
Q: A patient with appendicitis may have referred pain and viscerosomatic changes at which spinal level?
A: T10, corresponding to the umbilical referral and appendiceal autonomic level.
Q: Which parasympathetics innervate the descending colon?
A: Pelvic splanchnics from S2–S4.