Autonomic Nervous System Flashcards
(29 cards)
What neurons are in the dorsal horn?
afferent neurons
What neurons are in the lateral horn?
preganglions
What neurons are in the ventral horn?
efferent neurons
What motor neuron detects sensation?
beta
What motor neuron innervates the muscle for contraction?
alpha
What does the PNS do?
long term survival
What does the SNS do?
immediate survival
Where does the SNS range?
T1-L2
Where does the PNS range?
brainstem & S2-S4
What is the autonomic ganglia for?
communication from pre to post ganglionic neuron
General anatomy of SNS
short preganglionic neuron
long postganglionic neuron
Where does SNS preganglionic exit?
ventral root
What does SNS postganglionic exit as?
gray ramus
What does SNS preganglionic exit as?
white ramus
General anatomy of PNS
long preganlionic neuron
short postganglionic neuron
What are the cranial nerves of the PNS?
X, III, VII, IX
Properties of beta adrenergic receptors
all activate cAMP
beta 1 is excitatory (cardiac muscle)
beta 2 is inhibitory (ex. respiratory system)
What are adrenergic receptors coupled to?
G proteins
What do nicotinic cholinergic receptors do?
cause cation channels to open resulting in depolarization
What things happen during sympathetic activity?
pupils dilate, heart rate & blood pressure increase, gastrointestinal & urinary functions decrease
What things happen during parasympathetic activity?
gastrointestinal activates increase, heart rate & blood pressure decrease
What adrenergic receptor is responsible for vasoconstriction?
alpha 1
What is an autonomic neuroeffector junction?
synapses between efferent & effector organs
What is the somatic nervous system responsible for?
sensation & motor movement
