Celiac Ganglion (T5–T9)
Foregut: Stomach, Liver, Gallbladder, Spleen, Duodenum (1st/2nd)
Superior Mesenteric (T10–T11)
Midgut: Duodenum (3rd/4th) to proximal 2/3 transverse colon, Kidneys, Upper Ureter
Inferior Mesenteric (T12–L2)
Hindgut: Distal 1/3 transverse colon to rectum, Bladder, Prostate, Uterus
Parasympathetic Cutoff
Vagus (CN X) supplies up to distal 1/3 transverse colon; Pelvic Splanchnics (S2–S4) supply distal 1/3 to rectum
Master Sympathetic Innervation Levels
Sympathetic preganglionic cell bodies reside strictly in the intermediolateral cell column of the thoracolumbar spinal cord from T1 to L2:
| Organ / Structure | Sympathetic Spinal Level | Collateral Ganglion | Viscerosomatic Target |
|---|---|---|---|
| Head & Neck | T1–T4 | Superior Cervical Ganglion | T1–T4 paraspinal musculature |
| Heart | T1–T5 | Cervical / Upper Thoracic Ganglia | T1–T5 paraspinal (left > right in MI) |
| Lungs & Bronchi | T2–T7 | Thoracic Ganglia | T2–T7 paraspinal (asthma, bronchitis) |
| Stomach, Duodenum (proximal) | T5–T9 | Celiac Ganglion | T5–T9 paraspinal, epigastric tenderness |
| Liver, Gallbladder, Spleen | T5–T9 | Celiac Ganglion | Right T5–T9 (liver/GB); Left T5–T9 (spleen) |
| Pancreas | T5–T9 | Celiac & Superior Mesenteric | Bilateral T5–T9; severe burning back pain in pancreatitis |
| Small Intestine (jejunum, ileum) | T9–T11 | Superior Mesenteric | T9–T11 paraspinal |
| Ascending & Proximal 2/3 Transverse Colon | T10–T11 | Superior Mesenteric | Right T10–T11 paraspinal |
| Distal 1/3 Transverse, Descending Colon, Rectum | T12–L2 | Inferior Mesenteric | Left T12–L2 paraspinal |
| Kidneys | T10–T11 | Superior Mesenteric / Aorticorenal | T10–T11 paraspinal (ipsilateral flank) |
| Upper Ureters | T10–T11 | Superior Mesenteric | T10–T11 paraspinal |
| Lower Ureters | T12–L1 | Inferior Mesenteric | T12–L1 paraspinal (groin radiation) |
| Bladder, Uterus, Prostate | T11–L2 | Inferior Mesenteric | T11–L2 paraspinal, suprapubic pain |
| Ovaries & Testes | T10–T11 | Aorticorenal / Intermesenteric | T10–T11 paraspinal (embryologic origin) |
Parasympathetic Divisions: Vagus vs. Pelvic Splanchnics
Parasympathetic outflow is craniosacral, utilizing CN III, VII, IX, X and sacral spinal cord segments S2–S4:
Vagus Nerve (CN X)
Pelvic Splanchnic Nerves (S2–S4)
Originate from sacral cord segments S2, S3, and S4. Provide parasympathetic innervation to: distal 1/3 of the transverse colon, descending colon, sigmoid colon, rectum, lower ureters, urinary bladder, prostate, and reproductive organs.
The Cannon-Böhm Point
The transition zone located at the junction between the proximal two-thirds and distal one-third of the transverse colon, marking the precise boundary between vagal and pelvic splanchnic innervation.
COMLEX / OMM Integration
NBOME High-Yield Correlate
Treating Autonomic Imbalances
- Sympathetic Normalization: Rib raising (engages sympathetic trunk ganglia directly anterior to rib heads) and inhibitory pressure over collateral prevertebral ganglia (celiac, SMG, IMG along the linea alba).
- Parasympathetic Normalization: Suboccipital release and OA decompression (optimizes vagus nerve at jugular foramen) and Sacral Rocking (normalizes S2–S4 pelvic splanchnic outflow for constipation, dysmenorrhea, or pelvic pain).
- Parasympathetic Normalization: Suboccipital release and OA decompression (optimizes vagus nerve at jugular foramen) and Sacral Rocking (normalizes S2–S4 pelvic splanchnic outflow for constipation, dysmenorrhea, or pelvic pain).
Board Traps & Common Distractors
- Trap: Giving S2–S4 parasympathetics to the kidneys or ovaries/testes. Because these organs develop embryologically in the upper abdomen and descend, their parasympathetics are supplied by the Vagus nerve, NOT pelvic splanchnics!