Nerves of the abdomen

Question 1

Sympathetic nerves

Answer 1

Travel from CNS -> abdominal organs
Leave SC between T5-L2
Enter sympathetic chains bilaterally
Leave sympathetic chains with abdominopelvic splanchnic nerves
Synapse at prevertebral ganglia (at coeliac, SMA or IMA)
Post synaptic fibres pass from prevertebral ganglia surface of arterial branches leaving the AA
Hitch a ride towards smooth muscle and glands of organs

Question 2

At which level do abdominal sympathetic nerves leave the SC

Answer 2

T5-L2

Question 3

Parasympathetic nerves

Answer 3

Travel from CNS -> abdominal organs

Question 4

At which level to abdominal parasympathetic nerves leave the SC

Answer 4

Cranio-Sacral outflow
Cranial outflow - CNX
Sacral outflow - S2,3,4

Question 5

Parasympathetic nerves (CNX)

Answer 5

Supplies fibres to GI tract up until the distal end of transverse colon
Presynaptic fibres enter abdo cavity on surface of oesophagus
The fibres travel into periarterial plexuses
Carried to walls of organs and synapse in ganglia

Question 6

Parasympathetic nerves (S2,3,4)

Answer 6

Supply descending colon, sigmoid colon, rectum, anal canal

Pelvic splanchnic nerves

Question 7

Abdominal body wall nerves

Answer 7

Conveyed within thoracoabdominal nerves

7th -> 11th intercostal nerves