L3 Flashcards
What is the autonomic nervous system?
The visceral motor division of the PNS that innervates cardiac muscle, smooth muscle, and glands
What is the difference between a somatic and autonomic pathway?
Somatic uses only one motor neuron to consciously innervate skeletal muscle. In contrast, an autonomic pathway uses a relay of two neurons that regulate processes outside of conscious control
What areas do preganglionic neurons originate from?
Thoracolumbar area in the spinal cord (T1-L2)
What are the Cranial nerves of the parasympathetic division? Sacral?
III, VII, IX, X, S2-S4
What is the main difference in preganglionic axons of the sympathetic vs parasympathetic systems?
The sypathetic preganglionic axons are short and branched. Parasympathetic preganglionic axons are long and unbranched. Both are myelinated
Do collateral ganglia have synapses for nerves traveling to the adrenal medulla?
No
Where are collateral ganglia generally located?
Off to the side. Are celiac ganglia on the anterolateral surface of the aorta and the superior and inferior mesenteric ganglia associated with the digestive organs, renal and reproductive organs
T/F The adrenal medulla is like nervous tissue
True.
Does the enteric nervous system have its own reflex arc?
Yes. It regulates motility of viscera and secretion of digestive enzymes and acid in coordination with the autonomic nervous system
T/F The parasympathetic system is cholinergic.
True. Both the pre and post-ganglionic neurons release ACh
What kind of ACh receptors to postganglionic neurons have? Target cells?
Nicotinic. Muscarinic
T/F The sympathetic system is cholinergic and adrenergic
True
Which nt do most postganglionic sympathetic neurons release?
Norepinephrine
Are nicotinic receptors stimulatory or inhibitory? Muscarinic receptors?
Always stimulatory. Muscarinic are both.
What type of adrenergic receptors are found on all target organs of the sympathetic system except cardiac muscle?
Alpha-adrenergic
