THE SYMPATHETIC NERVE SYSTEM. 



611 



transmit nerve impulses upward, others downward, others again forward, to 

 the pre-vertebral and peripheral ganglia. 



FIG. 284. LUMBAR AND SACRAL PORTIONS OF THE SYMPATHETIC, i. Section of ihe dia- 

 phragm. 2. Lower end of the esophagus. 3. Left half of the stomach. 4. Small intestine. 

 5. Sigmoid flexure of the colon. 6. Rectum. 7. Bladder. 8. Prostate. 9. Lower end of the 

 left pneumogastric. 10. Lower end of the right pneumogastric. n. Solar plexus. 12. Lower 

 end of the great splanchnic nerve. -13. Lower end of the lesser splanchnic nerve. 14, 14. Last 

 two thoracic ganglia. 15, 15. The four lumbar ganglia. 16, 16, 17, 17. Branches from the 

 lumbar ganglia. 18. Superior mesenteric plexus. IQ, 21, 22, 23. Aortic lumbar plexus. 20. 

 Inferior mesenteric plexus. 24, 24. Sacral portion of the sympathetic. 25, 25, 26, 26, 27, 27. 

 Hypogastric plexus. 28, 29, 30. Tenth, eleventh, and twelfth dorsal nerves. 31, 32, 33, 34, 35, 

 36, 37, 38, 39. Lumbar and sacral nerves. (Sappey.) 



Among the rami efferentes or interconnecting cords, there are some 

 which possess special interest for the physiologist, viz. : 



