ANS Flashcards
the visceral motor division of the peripheral nervous systems divides into?
sympathetic and parasympathetic divisions
what are the three major targets of the ANS? what are there locations
cardiac muscle- heart
smooth muscle- blood vessels, arrestor pili, organs
glands- sweat, digestive, adrenal
what is the somatomotor pathway of the ANS
lower motor neuron in the ventral horn travels out through the ventral root and into the spinal nerve through thick myelinated axons and goes all the way to skeletal muscle
what is the pathway of the visceromotor pathway
motor axon in the lateral horn of the gray matter exits through the ventral root into the spinal nerve that is myelinated. The the axon stops and synapses with a ganglion and the second neuron gets to the target which could be cardiac muscle or smooth muscle or gland
axon that comes out of the CNS and leads to the ganglion is?
myelinated preganglionic neuron
axon with the cell body in the peripheral ganglion that goes directly to the organ is?
unmyelinated postganglionic neuron
what is the target of somatomotor neurons
skeletal muscle
what are the target of visceromotor neurons
cardiac muscle, smooth muscle, glands
somatomotor effects on target cells are?
always excitatory
visceromotor effects on target cells
are excitatory or inhibitory
What would happen if there was damage to the neuron on the way to innervate skeletal muscle
for skeletal muscle the muscle will never be able to contract
What would happen if there was damage to the neuron on the way to innervate cardiac muscle and smooth muscle?
there will still be contraction due to pacemaker cells. innervation changes the rate of contraction
which system is operating when we are relaxed?
parasympathetics (Rest and digest)
which system is operating when you are in fight or flight mode
sympathetics (fight or flight)
what do parasympathetic and sympathetic divisions have in common?
both are motor systems and the both require two neurons (preganglionic and postganglionic)
