Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11....
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Transcript of Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11....
![Page 1: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/1.jpg)
Ch. 11
Efferent peripheral nervous system
• Midterm 2 on Nov 11th will cover chapters 8, 10, 11.
• Today:– Autonomic division
• Homeostasis• Organization• Neurotranmsitters and neuromodulators• Receptors
![Page 2: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/2.jpg)
Mixed nerves
• Afferent and efferent fibers
• Autonomic fibers (involuntary)
• Somatic motor fibers (voluntary)
![Page 3: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/3.jpg)
Autonomic Division of the Peripheral Nervous System
• Sympathetic “branch”– dominates in stressful situations– In emergencies “fight or flight”– Always blood vessel diameter
• Parasympathetic “rest and digest”
![Page 4: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/4.jpg)
Sympathetic and parasympathetic contributions to homeostasis
• Maintain the internal environment
• Tonic control
• Antagonistic control
• Specific receptors determine responses
![Page 5: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/5.jpg)
Autonomic fibers exert tonic control of blood vessels- vasodilation or vasoconstriction
- sympathetic fibers- up or down control
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Dual antogonistic innervation
![Page 7: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/7.jpg)
Cooperation between sympathetic and parasympathetic effects
• E.g male reproductive system: – Parasympathetic fibers penile erection– Sympathetic fibers ejaculation
![Page 8: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/8.jpg)
Different effect with different receptor: vasodilation or vasoconstriction
![Page 9: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/9.jpg)
Brain regulates autonomic function
• Hypothalamus, pons, medulla
• Heart rate, blood pressure, temp. water balance
• Influence from limbic system and cerebral cortex
• Also autonomic reflexes e.g. urination
![Page 10: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/10.jpg)
Autonomic efferent pathways
**divergence**
![Page 11: Ch. 11 Efferent peripheral nervous system Midterm 2 on Nov 11 th will cover chapters 8, 10, 11. Today: –Autonomic division Homeostasis Organization Neurotranmsitters.](https://reader035.fdocuments.in/reader035/viewer/2022070415/5697bfe21a28abf838cb489a/html5/thumbnails/11.jpg)
Blue, parasympathetic,Red, sympathetic
Parasympathetic ganglia are close To the targets
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Autonomic neurotransmitters and receptors
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Neuroeffector junction: synaptic vesicles are in varicosites
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Norepinephrine release from varicosity: - MAO (monoamine oxidase) metabolizes NE
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