Chapter 15 Auntonomic Nervous System Flashcards
What is the ANS also knows as
Involuntary Nervous System
What do somatic and autonomic systems differ in
the neurons invloved in the outgoing motor pathway
In the somatic system what are the neurons like
neuron cell body in CNS
axon exted to skeletal muscle via cranial and spinal nerves
heavily myelinated big diameter
in the autonomic system what are the neurons like
2 neurons:
-preganglionic: cell body in brainstem or spinal cord
smaller diameter, lightly myelinated
terminates in ganglion
-postganglionic: cell body in ganglion outside of cns
even smaller diameter, unmyelinated
terminates in effector organ
what is dual intervention
sending signals to the same organs but have opposite effects
what does the sympathetic and parasympathetic civisons differ in
location of neurons/ganglia
neurotransmitters used
effects on target organs
receptors used
in the sympathetic nervous system where does the preganglionic cell body originate
thoracic and lumbar regions
in the parasympathetic nervous system where does the preganglionic cell body originate
brainstem and sacral regions
The ganglia of the sympathetic division is found where
close to the spinal cord
the ganglia of the parasympathetic divison is found where
in the wall of target organs
The SNS has ___________ fibers and _____________ fibers
short preganglionic, long postganglionic
The PNS has ____________ fibers and __________ fibers
long preganglionic , short postganglionic
what neurotransmitter does the preganglionic neuron of the sympathetic and parasympathetic use
acetylcholne
what neurotransmitter does the postganglionic neuron of the SNS release
norepeniphrine NE
what releases norepeniphrine
adrenergic fibers
