SNS-ANS
Autonomic Nervous System
Sympathetic Nervous System
Characteristics:
- Mass discharge of system
- Thoracoculumnar portion of spinal cord preganglionic neurons
- Ganglia are in a chain of paravetebral and prevertebral ganglia
- Postganglionic neurons are throughout the body
- High divergence - 1 pregang can activate 20 postgang
- "fight or flight" reading for stress
INC blood flow to the heart and skeletal muscle
DEC it to the GI tract and kidneys
INC breathing rate, heart rate
Ensures adequate supply of O2 to meet the demands of the contracting skeletal muscles
Pupils DIALATE
Pregangionlic PRI - ACh
Causes the release from the adrenal medulla
Postgangionic SEC - NE
Structure:
Concept:
The ganglia of the SNS is farther from the target organ vs PNS because of general stress reaction
