Unit 1. Lec 7-The Autonomic Nervous System

Question 1

What are the two major parts of the nervous system?

Answer 1

• Central Nervous System
• Peripheral Nervous System

Question 2

What is part of the of the central nervous system?

Answer 2

• Brain + Spinal cord

Question 3

What is part of the peripheral nervous system?

Answer 3

• Everything outside of the CNS
  1. Somatic Nervous System: Voluntary control of skeletal muscle
  2. Autonomic Nervous System: Involuntary control of viscera
• Symphathetic: “Fight or Flight”
• Parasymphatetic: “Rest, digest & repair
  3. Enteric Nervous System

Question 4

Autonomic Nervous System

• Target tissue?
• Distal synapse location?
• Post synaptic nerve?
• Networks?
• Results of denervation?

Answer 4

• Target tissue: Visceral organs, glands, smooth muscle
• Distal synapse location: Peripheral ganglia
• Post synaptic nerve: Non-myelinated
• Networks: Forms network
• Results of denervation: Spontaneous activity

Question 5

Somatic Nervous System

• Target tissue?
• Distal synapse location?
• Post synaptic nerve?
• Networks?
• Results of denervation?

Answer 5

• Target tissue: Skeletal muscle
• Distal synapse location: Cerebrospinal Axis
• Post synaptic nerve: Myelinated
• Networks: Does NOT form networks
• Results of denervation: Paralysis, atrophy

Question 6

In the Sympathetic Division of the ANS what is its satelite office nerve and where is it located?

Answer 6

Paravertebral ganlia (close to the spinal cord)

Question 7

What are Pre-Ganglionic Neurons?

Answer 7

• Short cholinergic (ACh) projections leave CNS to innervate ganglia

Question 8

What are the Post-Ganglionic Neurons?

Answer 8

• Long adrenergic (NE) projections leave ganglia to innervate effectors
• Exception: Kidney has dopaminergic innveration

Question 9

What are the sympathetic action of the eye and what tissues are affected?

Answer 9

Eye

• Contracts-Radial muscle
• [Relaxes]- Cillary muscle

Question 10

What are the sympathetic action of the heart and what tissues are affected?

Answer 10

• Accelerates- SA Node, Ectopic pacemakers
• Increases- Contractility

Question 11

What are the sympathetic action of blood vessels and what tissues are affected?

Answer 11

• Contracts-Skin and Splanchnic
• Relaxes/[Contracts]-Skeletal muscle, Coronary
• Releases NO (EDRF)- Endothelium