Podcast
Questions and Answers
Where are the cell bodies of preganglionic neurons located in the sympathetic division?
Where are the cell bodies of preganglionic neurons located in the sympathetic division?
- Lateral horns of the gray matter in the 12 thoracic and first 2 or 3 lumbar segments (correct)
- Nuclei of four cranial nerves (III, VII, IX and X) in the brain stem
- Autonomic ganglia
- Lateral gray matter of sacral segments 2–4 of the spinal cord
The parasympathetic division is generally faster than the sympathetic division.
The parasympathetic division is generally faster than the sympathetic division.
False (B)
What are the two major types of sympathetic ganglia?
What are the two major types of sympathetic ganglia?
Sympathetic trunk ganglia and prevertebral ganglia
The ______ division of the autonomic nervous system contains preganglionic neurons in the nuclei of four cranial nerves (III, VII, IX and X) in the brain stem.
The ______ division of the autonomic nervous system contains preganglionic neurons in the nuclei of four cranial nerves (III, VII, IX and X) in the brain stem.
Match the following autonomic ganglia types with their descriptions:
Match the following autonomic ganglia types with their descriptions:
The [BLANK] nervous system operates largely without conscious control.
The [BLANK] nervous system operates largely without conscious control.
Somatic motor neurons synapse directly with skeletal muscle.
Somatic motor neurons synapse directly with skeletal muscle.
Match the following neurotransmitters with their respective release locations:
Match the following neurotransmitters with their respective release locations:
What are the two main divisions of the autonomic nervous system?
What are the two main divisions of the autonomic nervous system?
Which of the following is NOT a characteristic of the autonomic nervous system?
Which of the following is NOT a characteristic of the autonomic nervous system?
Sensory receptors called [BLANK] monitor conditions in the internal environment.
Sensory receptors called [BLANK] monitor conditions in the internal environment.
All sympathetic postganglionic neurons release acetylcholine.
All sympathetic postganglionic neurons release acetylcholine.
Explain the difference between the somatic and autonomic nervous systems in terms of their effector organs.
Explain the difference between the somatic and autonomic nervous systems in terms of their effector organs.
What are the possible pathways for an axon in the sympathetic division?
What are the possible pathways for an axon in the sympathetic division?
The sympathetic division is responsible for 'fight-or-flight' responses.
The sympathetic division is responsible for 'fight-or-flight' responses.
What is the function of prevertebral ganglia in the sympathetic nervous system?
What is the function of prevertebral ganglia in the sympathetic nervous system?
The cell bodies of sympathetic preganglionic neurons are located in the ______ of the spinal cord.
The cell bodies of sympathetic preganglionic neurons are located in the ______ of the spinal cord.
Match the following autonomic plexuses with their corresponding location:
Match the following autonomic plexuses with their corresponding location:
Which of the following statements about the parasympathetic division is TRUE?
Which of the following statements about the parasympathetic division is TRUE?
The paired sympathetic trunk ganglia are located posterior to the vertebral column.
The paired sympathetic trunk ganglia are located posterior to the vertebral column.
What is the role of the adrenal medullae in the sympathetic nervous system?
What is the role of the adrenal medullae in the sympathetic nervous system?
Which neurotransmitter is released by cholinergic neurons?
Which neurotransmitter is released by cholinergic neurons?
Adrenergic neurons release acetylcholine.
Adrenergic neurons release acetylcholine.
What are the two main types of cholinergic receptors?
What are the two main types of cholinergic receptors?
The activation of nicotinic receptors on skeletal muscle fibers leads to ______ of the muscle.
The activation of nicotinic receptors on skeletal muscle fibers leads to ______ of the muscle.
Match the following receptor types with their primary location:
Match the following receptor types with their primary location:
Muscarinic receptors are only found in parasympathetic nervous system.
Muscarinic receptors are only found in parasympathetic nervous system.
What is the main effect of activating muscarinic receptors on blood vessels in skeletal muscle?
What is the main effect of activating muscarinic receptors on blood vessels in skeletal muscle?
Which of the following is NOT a major location of nicotinic receptors?
Which of the following is NOT a major location of nicotinic receptors?
What is the primary neurotransmitter released by preganglionic neurons in both the sympathetic and parasympathetic divisions?
What is the primary neurotransmitter released by preganglionic neurons in both the sympathetic and parasympathetic divisions?
Parasympathetic preganglionic neurons have longer axons than sympathetic preganglionic neurons.
Parasympathetic preganglionic neurons have longer axons than sympathetic preganglionic neurons.
What is the primary function of the parasympathetic nervous system?
What is the primary function of the parasympathetic nervous system?
Parasympathetic postganglionic neurons release ______, which is excitatory and stimulates target organs.
Parasympathetic postganglionic neurons release ______, which is excitatory and stimulates target organs.
Match the following characteristics with their respective divisions of the autonomic nervous system:
Match the following characteristics with their respective divisions of the autonomic nervous system:
Which of the following is NOT a characteristic of the parasympathetic nervous system?
Which of the following is NOT a characteristic of the parasympathetic nervous system?
Describe the difference in axon length between sympathetic and parasympathetic preganglionic neurons.
Describe the difference in axon length between sympathetic and parasympathetic preganglionic neurons.
The parasympathetic nervous system is primarily involved in stimulating digestion and slowing heart rate.
The parasympathetic nervous system is primarily involved in stimulating digestion and slowing heart rate.
Which of the following is NOT a location where α1 receptors are found?
Which of the following is NOT a location where α1 receptors are found?
Activation of α2 receptors on pancreatic islet beta cells leads to an increase in insulin secretion.
Activation of α2 receptors on pancreatic islet beta cells leads to an increase in insulin secretion.
What is the primary effect of activating α1 receptors on smooth muscle fibers of blood vessels?
What is the primary effect of activating α1 receptors on smooth muscle fibers of blood vessels?
Activation of β2 receptors on smooth muscle fibers of certain blood vessels results in ______.
Activation of β2 receptors on smooth muscle fibers of certain blood vessels results in ______.
Match the following adrenergic receptor subtypes with their primary effects:
Match the following adrenergic receptor subtypes with their primary effects:
Which of the following is a primary effect of activating β1 receptors?
Which of the following is a primary effect of activating β1 receptors?
Activation of α1 receptors on sweat glands increases sweating.
Activation of α1 receptors on sweat glands increases sweating.
What is the primary effect of activating β2 receptors on the bronchioles of the lungs?
What is the primary effect of activating β2 receptors on the bronchioles of the lungs?
Flashcards
Somatic Motor Pathway
Somatic Motor Pathway
A direct pathway where motor neurons from the CNS synapse with skeletal muscle.
Autonomic Nervous System (ANS)
Autonomic Nervous System (ANS)
Part of the nervous system that regulates involuntary functions without conscious control.
Preganglionic Neurons
Preganglionic Neurons
Neurons that extend from the CNS and synapse with postganglionic neurons in autonomic ganglia.
Postganglionic Neurons
Postganglionic Neurons
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Neurotransmitters in Somatic System
Neurotransmitters in Somatic System
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Neurotransmitters in Autonomic System
Neurotransmitters in Autonomic System
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Effectors of Somatic System
Effectors of Somatic System
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Effectors of Autonomic System
Effectors of Autonomic System
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Motor Neurons
Motor Neurons
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Sympathetic Division
Sympathetic Division
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Parasympathetic Division
Parasympathetic Division
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Vagus Nerve
Vagus Nerve
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Sympathetic Ganglia
Sympathetic Ganglia
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Ways Sympathetic Axons Connect
Ways Sympathetic Axons Connect
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Sympathetic trunk ganglia
Sympathetic trunk ganglia
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Sympathetic outflow
Sympathetic outflow
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Parasympathetic outflow
Parasympathetic outflow
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Autonomic plexuses
Autonomic plexuses
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Celiac plexus
Celiac plexus
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Spinal cord segments
Spinal cord segments
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Cholinergic Neurons
Cholinergic Neurons
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Cholinergic Receptors
Cholinergic Receptors
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Nicotinic Receptors
Nicotinic Receptors
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Muscarinic Receptors
Muscarinic Receptors
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Adrenergic Neurons
Adrenergic Neurons
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Norepinephrine
Norepinephrine
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Cholinergic Effects
Cholinergic Effects
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Adrenergic Effects
Adrenergic Effects
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Adrenergic Receptors
Adrenergic Receptors
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Alpha-1 Receptors
Alpha-1 Receptors
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Alpha-1 Effects
Alpha-1 Effects
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Alpha-1 Locations
Alpha-1 Locations
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Alpha-2 Receptors
Alpha-2 Receptors
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Alpha-2 Effects
Alpha-2 Effects
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Alpha-2 Locations
Alpha-2 Locations
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Sweat Gland Activation
Sweat Gland Activation
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Parasympathetic Nervous System
Parasympathetic Nervous System
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Craniosacral Origin
Craniosacral Origin
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Axon Length in Parasympathetic
Axon Length in Parasympathetic
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Postganglionic Neurons in Parasympathetic
Postganglionic Neurons in Parasympathetic
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Neurotransmitter in Parasympathetic
Neurotransmitter in Parasympathetic
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Effects of Parasympathetic Activation
Effects of Parasympathetic Activation
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Communication Rami in Parasympathetic
Communication Rami in Parasympathetic
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Preganglionic vs. Postganglionic Neurons
Preganglionic vs. Postganglionic Neurons
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Study Notes
Autonomic Nervous System
- The autonomic nervous system (ANS) is responsible for involuntary actions
- It involves two main divisions:
- Sympathetic: "fight-or-flight" response, increasing alertness
- Parasympathetic: "rest-and-digest," slows down body activities
Introduction
- The chapter aims to examine the structure and function of the ANS
- It will compare and contrast the somatic and ANS
- It also covers ANS neurotransmitters
- Finally it compares and contrasts sympathetic and parasympathetic nervous systems
Comparison of Somatic and Autonomic Nervous Systems
- The somatic nervous system includes sensory and motor neurons for voluntary actions (like moving skeletal muscles)
- Sensory neurons transmit information from receptors (pain, touch etc.)
- The autonomic nervous system receives input from sensory receptors in organs, blood vessels, and muscles (involuntary actions)
Anatomy of Autonomic Motor Pathways
- The ANS typically uses two neurons to transmit impulses.
- Preganglionic: cell body in CNS, axon extends to a ganglion.
- Postganglionic: cell body in ganglion, axon extends to an effector (organ, muscle, gland)
Divisions of the ANS
- Most body organs receive input from both sympathetic and parasympathetic systems.
- Usually one division stimulates, while the other inhibits.
Comparison of Sympathetic and Parasympathetic Divisions
- Sympathetic (Thoracolumbar):
- Originates in the thoracic and lumbar spinal cord
- Primarily involved in the fight-or-flight response
- Releases norepinephrine (NE) at the postganglionic synapse, except at sweat glands
- Parasympathetic (Craniosacral):
- Originates in the brain stem and sacral spinal cord
- Primarily involved in rest-and-digest activities.
- Releases acetylcholine (ACh) at the postganglionic synapse.
ANS Neurotransmitters and Receptors
- Cholinergic neurons release acetylcholine (ACh)
- Nicotinic receptors are found at the synapses between preganglionic and postganglionic neurons
- Muscarinic receptors are found at the postganglionic synapses in the parasympathetic division
- Adrenergic neurons release norepinephrine (NE)
- Receptors also exist and respond differently
Physiology of the ANS
- Sympathetic stimulation: increases heart rate, blood pressure, and breathing rate.
- Parasympathetic stimulation: decreases heart rate, blood pressure, and breathing rate, stimulates digestion.
- SLUDD : Salivation, Lacrimation, Urination, Digestion, Defecation.
- Autonomic tone: balanced activity of sympathetic and parasympathetic systems, regulated by hypothalamus
Integration and Control of Autonomic Functions
- Autonomic reflexes:
- Involuntary responses to internal stimuli, involving receptors, sensory neurons, integration centers, motor neurons, and effectors
- Stress response: complex interaction of sympathetic and other systems causing hormonal releases for long term stress responses
Anatomy Overview of Autonomic Nervous System
- The page describes different parts and locations of autonomic pathways, including types of ganglia
- Types and locations of ganglia, the locations of cell bodies of preganglionic neurons for sympathetic and parasympathetic pathways, and the relationship between the sympathetic trunk ganglia and prevertebral ganglia.
Additional details from later slides
- Raynaud's phenomenon: excessive sympathetic stimulation in blood vessels of fingers and toes causes vasoconstriction, leading to numbness and ischemia.
- The autonomic nervous system has major plexuses (networks of nerves) in abdomen and pelvis, named after the arteries associated with them.
- There are different types of nerve pathways and processes relating to these pathways.
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