Efferent ANS Flashcards
SNS origin
Thoracolumbar
-T1-L3
SNS cell body origin
Intermediolateral horn of spinal cord
SNS axon exit location
Ventral roots
Parasympathetic origin
Craniosacral
-CN 3, 7, 9, 10
-S2-3
SNS ganglia location
Near spinal cord (sympathetic chain)
Parasympathetic ganglia
Near or inside effector organ/ tissue
SNS post- to- preganglionic ratio
30:1
Parasympathetic post- to- preganglionic ratio
1:1 to 3:1
SNS or parasympathetic: Postsynaptic amplification contributes to mass response
SNS
SNS or parasympathetic: Precise control of each effector organ/ tissue
Parasympathetic
SNS or parasympathetic: Long, myelinated B fiber (preganglionic)
Parasympathetic
SNS or parasympathetic: Short, myelinated B fiber (preganglionic)
SNS
SNS or parasympathetic: Long, unmyelinated C fiber (postganglionic)
SNS
SNS or parasympathetic: Short, unmyelinated C fiber (postganglionic)
Parasympathetic
SNS neurotransmitter at ganlgia
ACh
Parasympathetic neurotransmitter at ganglia
ACh
SNS receptor at ganglia
Nicotinic type Nn
Parasympathetic receptor at ganglia
Nicotinic type Nn
Neurotransmitter from most postganglionic fibers
Norepinephrine
Neurotransmitter from postganglionic fiber
ACh
Where is ACh the neurotransmitter in the SNS?
Sweat glands
Piloerector muscles
Some blood vessels
Receptor at effector organ- SNS
Alpha
Beta
Dopamine
(some) Muscarinic
Receptor at effector organ- PNS
Muscarinic
Where in the body is norepinephrine and epinephrine released directly into the system?
Chromaffin cells of the adrenal medulla
