Innervate on of Thoracic and Abdominal Organs

Parasympathetic effect on lungs

Bronchoconstriction

Sympathetic effect on lungs

Bronchodilation

Parasympathetic effect on digestive tract

Stimulates peristalsis and secretion

Sympathetic effect on digestive tract

Inhibits peristalsis; constricts GI blood vessels

Foregut components

Esophagus, stomach, proximal duodenum, liver, gallbladder, pancreas

What gut section does spleen innervation mimic?

Foregut

Midgut componenets

Distal duodenum, jejunum, ileum, cecum, appendix, ascending colon, proximal 2/3 of transverse colon

Hindgut components

Distal 1/3 of transverse colon, descending colon, sigmoid colon, rectum

Parasympathetic nerve fiber pathway for lungs, heart, foregut, and midgut

Preganglionic cell bodies in the brain, preganglionic fibers in vagus nerves (CN X), postganglionic cells and fibers in wall of target organ

Parasympathetic nerve fiber pathway for hindgut

Preganglionic cell bodies in intermediate gray matter of sacral spinal cord S2; preganglionic fibers travel from ventral root —> spinal nerve —> ventral ramus —> pelvic splanchnic nerves; postganglionic cell bodies and fibers in walls of target organs

Which splanchnic nerves are parasympathetic?

Pelvic splanchnic nerves

Where is border of midgut and hindgut

Proximal 2/3 (vagus nerves) vs distal 1/3 (pelvic splanchnic nerves) of transverse colon

Sympathetic nerve fiber pathway for lungs and heart

Preganglionic cell bodies in lateral horn of thoracic spinal cord—> ventral root —> spinal nerve —> ventral ramus —> white ramus communicans —> sympathetic trunk —>postganglionic cell bodies in the paravertebral ganglia of the sympathetic trunk; post ganglionic fibers in the cardiopulmonary splanchnic nerves to target organ

Sympathetic nerve fiber pathway for digestive tract

Preganglionic cell bodies in lateral horn of thoracic spinal cord—> ventral root —> spinal nerve —> ventral ramus —> white ramus communicans —> sympathetic trunk —> continue onward as thoracic or lumbar splanchnic nerves —> travel towards abdominal aorta to synapse with prevertebral ganglia —> target organ

greater, lesser, and least thoracic splanchnic nerves pierce the ________

Diaphragm

How does the foregut sympathetic nerve fiber pathway differ from the others?

Greater thoracic splenic nerve —> celiac ganglion (just inferior to diaphragm, next to celiac trunk)

How does the foregut sympathetic nerve fiber pathway differ from the others?

Greater, lesser, and least thoracic splanchnic nerves —> celiac and superior mesenteric ganglia (these are close together)

How does the hindgut sympathetic nerve fiber pathway differ from the others?

Lumbar splanchnic nerve (doesn't pierce diaphragm b/c originates in the abdomen) —> inferior mesenteric ganglion

Visceral sensory pathway for cardiac pain

Follows sympathetic pathway back to spinal cord and enters dorsal root