Lecture 14 9/11/23 Flashcards
Which part of the brain controls the autonomic nervous system?
hypothalamus
How does the ANS differ from the somatic nervous system?
there is no voluntary control over the actions of the ANS
What are the two branches of the ANS?
-parasympathetic nervous system
-sympathetic nervous system
How do the sympathetic and parasympathetic nervous systems differ in terms of activity?
-PNS is continuously active
-SNS has low resting tone but is capable of bouts of great activity
How many neuronal cell bodies does each ANS neuron system have?
two
Where are the two neuronal cell bodies located for each ANS neuron system?
-1st in the CNS
-2nd in the ganglion of PNS
What is the term for the first neuron of an ANS neuron system?
preganglionic neuron
What is the term for the second neuron of an ANS neuron system?
postganglionic neuron
Where do the parasympathetic ANS fibers leave the CNS?
brainstem and sacral spinal cord
Where do the sympathetic ANS fibers leave the CNS?
thoracolumbar spinal cord (T1-L3)
What do the preganglionic fibers do after leaving the CNS?
reach the ganglions and synapse with the postganglionic neurons
What is the overarching role of the sympathetic nervous system?
fight or flight
What is the anatomy of the 1st neuron in the sympathetic nervous system?
-short preganglionic axons
-run to the sympathetic trunk ganglia
What is the sympathetic trunk?
connected chain of paravertebral ganglia
What is the anatomy of the 2nd neuron in the sympathetic nervous system?
-long axons
-leave ganglion and go to target organ