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UCONN - PNB 2264 - Class Notes - Week 12

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UCONN - PNB 2264 - Class Notes - Week 12

School: University of Connecticut
Department: Physiology
Course: Human Physiology and Anatomy
Professor: Kristen Kimball
Term: Fall 2018
Tags:
Name: PNB 2264 Week 12 Notes
Description: These notes cover the autonomic nervous system in its entirety.
Uploaded: 12/02/2018
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background image PNB week 12 Autonomic vs somatic nervous system Somatic o Voluntary Exception involuntary reflexes  o Controlling Skeletal muscle – deals with general senses touch, pain,  temp.  o Afferent sensory info, efferent motor info
o Exception involuntary reflexes 
o Synapse between neuron and skeletal muscle
alpha neuron originates in nervous system then goes to target 
skeletal muscle 
Acetylcholine neurotransmitter and receptor Any neuron that releases acetylcholine is a cholinergic 
neuron 
No inhibitory only excite or not  Single long axon  Autonomic - “visceral nervous system” o Controls processes inside body 
o Involuntary
o Afferent- sense stretch of muscle on walls of organ 
o Efferent – contract cardiac or smooth muscle
o Still originates in central nervous system
Motor/efferent still comes out of ventral horn  o Difference lies in target tissue Anything other than skeletal muscle  Cardiac muscle o Heart rate Smooth muscle  o Blood vessels- Blood pressure  Adipocytes o Changes energy balance  Glands  o Secretion  Saliva, acid production  Two axons instead of one  One neuron from central nervous system which form synapse 
with another neuron that connects to target tissue 
Synapse between two neurons outside central nervous 
system is called a Ganglion 
Preganglionic and postganglionic fibers  Allows more control but also more complicated 
background image PNB week 12 Different signaling possibilities: excite or inhibit  o Divisions of ANS Sympathetic division “fight or flight” Organized for vast discharge  Preganglionic (cholinergic o Originates in CNS (T1- L2)- most of spine(thoracic  through lumbar) Postganglionic (adrenergic neurons o Where does ganglion form  1) Sympathetic chain  Most common  Ganglion directly adjacent to spinal 
cord on both sides – two chains 
2) Collateral Ganglia  Ganglia found in abdominal cavity and
reproductive tract, close to target 
organs 
on ventral surface 3)Adrenal gland Preganglionic neuron stimulates inside
of adrenal gland – adrenal medulla 
Instead of a post ganglionic neuron 
there is an epithelial/secretory cell
o Chromaffin cells Secrete epinephrine 
(adrenaline)
Secrete norepinephrine 
(noradrenaline) 
Vascular like blood 
vessels 
Secrete into blood stream Allows wide systemic 
effect
Symptoms  o Increased heart rate
o Constrict BV in GI
o Increased respiration rate
o Sweating
o Dilate BV around skeletal muscle
o Dilation of airways 
Parasympathetic  “rest and digest”  Not organized for mass discharge  Cholinergic neurons  Preganglionic 

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School: University of Connecticut
Department: Physiology
Course: Human Physiology and Anatomy
Professor: Kristen Kimball
Term: Fall 2018
Tags:
Name: PNB 2264 Week 12 Notes
Description: These notes cover the autonomic nervous system in its entirety.
Uploaded: 12/02/2018
4 Pages 48 Views 38 Unlocks
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  • Notes, Study Guides, Flashcards + More!
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