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Sympathetic Nervous Systems Cheat Sheet by

system     medical     human     body     nervous     sympathetic

Introd­uction

The sympat­hetic nervous system (SNS) is one of the two main divisions of the autonomic nervous system, the other being the parasy­mpa­thetic nervous system.

The autonomic nervous system functions to regulate the body's uncons­cious actions. The sympat­hetic nervous system's primary process is to stimulate the body's fight-­or-­flight response. It is, however, constantly active at a basic level to maintain homeos­tasis. The sympat­hetic nervous system is described as being comple­mentary to the parasy­mpa­thetic nervous system which stimulates the body to "­Res­t-a­nd-­Dig­est­" or "­Fee­d-a­nd-­Bre­ed".

Autonomic nervous supply to organs

Organ
Nerves
Spinal column
stomach
PS: anterior & posterior vagal trunks
S: greater splanchnic nerves
T6-T9, sometimes T10
duodenum
PS: vagus nerves
S: greater splanchnic nerves
T5-T9, sometimes T10
pancreatic head
PS: vagus nerves
S: thoracic splanchnic nerves
T8-T9
jejunum & ileum
PS: posterior vagal trunks
S: greater splanchnic nerves
T5-T9
colon
PS: vagus nerves & pelvic splanchnic nerves
S: greater splanchnic nerves
T10-T12 (proximal colon)
L1-L3, (distal colon)
spleen
S: greater splanchnic nerves
T6-T8
vermiform appendix
nerves to superior mesenteric plexus
T10
gallbl­adder & liver
PS: vagus nerve
S: celiac plexus
right phrenic nerve
T6-T9
Kidneys & Ureters
PS: vagus nerve
S: thoracic & lumbar splanchnic nerves
T11-T12
 

Sympat­hetic Nervous System

Organ & Effect

Organ
Effect
Eye
Dilates pupil
Heart
Increases rate & force of contra­ction
Lungs
Dilates bronch­ioles via circul­ating adrenaline
Blood Vessels
Dilate in skeletal muscle
Constricts in gastro­int­estinal organs
Sweat Glands
Activates sweat secretion
Digestive tract
Inhibits perist­alsis
Kidney
Increases renin secretion
Penis
Inhibits Tumescence
Ductus deferens
Promotes emission prior to ejacul­ation

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