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50 Cards in this Set
- Front
- Back
Part that contains brain and spinal cord |
Central nervous system |
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Part that contains everything else such as sensory information and all info flowing out of the cns |
Peripheral nervous system |
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PNS is further divided into |
sensory and motor division |
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This division includes nerves that have sensory function and carry impulses to CNS for integration |
Sensory/afferent division |
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This division include nerve fibers that carry impulses away from the CNS |
Motor or efferent division |
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Motor division is divided to two |
Somatic nervous system Autonomic nervous system |
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Mainly motor nerves to skeletal muscle |
Somatic nervous system |
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Responsible for regulation of involuntary functions |
Autonomic nervous system |
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Responsible for maintaining internal environment of the body (homeostasis) |
Autonomic nervous system |
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Regulates organ system of the body, controls homeostasis Regulates many of the internal organs through a balance of 2 aspects (PARA AND SYMPA NS) |
Autonomic nervous system |
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Originate from the CNS and synapse at the ganglion |
Preganglionic neuron |
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Its cell body is in the autonomic ganglion |
Postganglionic neuron |
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What are the division of the ANS |
Parasympathetic (cholinergic) division Sympathetic (adrenergic) division |
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Mediates rest and digest |
PARASYMPATHETIC |
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Mediates fight and flight |
SYMPATHETIC |
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These two are more of anatomical division |
Parasympathetic Sympathetic |
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They are based on the neurotransmitter being secreted are ohysiological divisiin |
Cholinergic and adrenergic |
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Component: path of preganglionic cell |
PNS: CN 3,7,9,10 SNS: TI-L2 |
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Component: preganglionic fiber length |
PNS: long SNS: short |
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Component: preganglionic myelination |
PNS: myelinated SNS: myelinated |
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Component: pre to postganglionic ratio |
PNS: one to one (except vagus nerve) SNS: one to many |
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Component: preganglionic cell NT |
PNS: ach SNS: ach |
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Component: postganglionic cell location |
PNS: on or near origin SNS: sympathetic chain next to spinal cord |
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Component: postganglionic fiber length |
PNS: short SNS: long |
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Component: postganglionic myelination |
PNS: unmyelinated SNS: unmyelinated |
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Postganglionic cell NT |
PNS: ach SNS: NE, EPI, ACH |
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2 major neurochemical transmitters |
Norepinephrine Acetylcholine |
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Major neurotransmitter at the terminals of postg. fibers in junction of sympa division |
Norepinephrine |
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Postganglionic fibers of norepinephrine |
Adrenergic fibers |
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Transmitter released at peripheral motor portions of the ANS |
Acetylcholine |
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Fiber of acetylcholine |
Cholinergic fibers |
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Peripheral motor portions of acetylcholine |
1. Preganglionic parasympathetic fibers 2. Preganglionic sympathetic fibers 3. Postganglionic parasympa. fibers at neuroeffector junction 4. Splanchnic nerve terminal in adrenal medulla 5. Sympathetic postganglionic neurons which innervate sweat glands and blood vessels of skeletal muscles 6. Somatic nerve terminals at neuromuscular junctions |
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An important component of sympathetic nervous system Chromaffin cells are present |
Adrenal medulla |
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These cells are considered modified adrenergic nerve cells that contains epinephrine (also norepi) |
Chromaffin cells |
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Supplies the adrenal medulla that causes release of epi. from chromaffin cells |
Splanchnic nerve |
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Receptors are collectively known as |
Adrenal receptors |
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2 types of receptors in the ANS |
Cholinergic receptors Adrenergic receptors |
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Cholinergic receptors are classified into |
Muscarinic and Nicotinic receptors |
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Stimulated by muscarine Blocked by atropine |
Muscarinic receptors |
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Poisonous substance from a mushroom |
Muscarine |
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Give effects of muscarine |
1. Increase gland secretion 2. Enhanced contraction of smooth muscles 3. Depressed cardiac muscle activity |
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Stimulated by nicotine |
Nicotinic receptor |
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Give effects of nicotine |
1. Overstimulation of parasympathetic and sympathetic postganglionic nerve fibers 2. Increase skeletal muscle contraction |
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2 subtypes of nicotinic receptors |
Ganglionic Neuromuscular junction |
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Found in the ganglia of both sympa and parasympa divisions |
Ganglionic |
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Ganglionic receptors are blocked by |
Hexamethonium |
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Found in the motor end plate Strictly not a part of the autonomic nervous system but uses acetylcholine |
Neuromuscular junction |
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Motor end plate is blocked by |
Curare |
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Adrenergic receptors are classified as |
Alpha 1 and 2 adrenergic receptor Beta 1 and 2, 3 adrenergic receptor Gamma dopaminergic receptors |
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Adrenergic receptors can be stimulated by |
Cathecolamine |