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Autonomic Nervous System Cheat Sheet by

anatomy

ANS vs Somatic

Factor
Autonomic
Somatic
Effectors
Smooth muscle and glands
Skeletal Muscle
Efferent Pathways
Two neuron chain with ganglia
Single Neuron
NT Effects
PS: ACh / S: NE (can be inhibitory or stimul­atory)
ACh (only stimul­atory)

Sympat­hetic Vs Parasy­mpa­thetic

Factor
Parasy­mpa­thetic
Sympat­hetic
Origin Site
Brain & Spinal Cord
Thorac­olumbar
Pre/Post Fiber Length
Long/Short
Short/Long
Ganglia Location
In Visceral Effector Organs
Close to Spinal Cord

Receptors in ANS

Type
Location
Effect on Binding
Nicotinic (ACh)
All Gang. Neurons; Adrenal Medullary Cells; NMJ
Ex.
Muscarinic (ACh)
All Para targets (symp. eccrine sweat glands and blood vessels in skel musc.)
Ex (xcept heart); Activation
B1 (NE/E)
HEART + kidneys + adipose tissue
HR/FORCE; RENIN
B2 (NE/E)
Lungs, Symp Tissue, BV (heart, liver, skel m.)
Mostly Inhibitory
B3 (NE/E)
Adipocytes
LIPOLYSIS
A1
BV in viscera, skin, mucosa; All Sym. targets except heart
BV CONSTRICT; pupils dilate
A2
Adrenergic axon term.; Pancreas; Platelets
Inh. NE + insulin release; Up Clotting
 

Parasy­mpa­thetic (Crani­osa­cral)

Cranial Outflow Functions

[III]
Constrict Pupils; Bulge Lenses
[VII]
Nasal + Lacrimal Glands -or- Sublingual + Subman­dibular
[IX]
Activate Parotid Salivary Glands

Levels of ANS Control

 

Sympat­hetic Outflow

Visceral Reflex Arc

Sympat­hetic Chains

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