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Automatic Nervous System
Automatic Nervous System LG
19
Anatomy
Undergraduate 3
11/07/2011

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Term
2 subdivisions:
Definition
sympathetic & parasympathetic
Term
sympathetic
Definition
cell bodies in thorax & lumbar section of the spinal cord
-fight or flight
-raises heart/breathing rate
Term
parasympathetic
Definition
cell bodies in brain (cranial) & sacral section of the spinal cord
-rest & digest
-brings down breathing & heart rate
Term
Two fiber types
Definition
preganglionic & postganglionic
Term
preganglionic
Definition
shorter
cell body in CNS
Term
postganglionic
Definition
longer
cell body in PNS
Term
Sympathetic: location
Definition
-preganglionic cell bodies in lateral gray horns in thoracolumbar region of cord
Term
Sympathetic: ganglia
Definition
where the pre (short) & post (long) ganglian neurons meet
2 types:
sympathetic chain: along spine
collateral ganglia: celiac, superior & inferior mesenteric
Term
sympathetic: neurotransmitters
Definition
preganglionic release Acetylchonie ACH (cholingergic synapse)
-excitatory
postganglionic release Norepinephrine (adrenergic synapse)
-excitatory
Term
Sympathetic: Receptor types
Definition
2 classes for NE:
(alpha)--constric peripheral blood vessels, close sphincters
(beta)--increase metab. rate, relax blood vessels & airway muscles
1-heart: increase HR, incr, contraction strength
2-bronchioles (open airways)
Term
parasympathetic division: location
Definition
preganglionic cell bodies in brain and sacral region of spinal cord
Term
Parasympathetic: ganglia
Definition
again--> where pre(short) & post(long) ganglionic neurons meet
-peripheral ganglia in or near target organ
a)CN III, VII, IX, X (vegus): majority of body
b)Pelvic nerves: kidney, bladder, reprod organs, end of LG intestine
Term
parasympathetic: neurotransmitters
Definition
ACH released by pre (excitatory) ad post (excitatory or inhibitory) ggl neurons everywhere but post ggl in sympathetic
Term
Parasympathetic: Receptor Types
Definition
2 types of ACH receptors:
-nicotinic (Excitatory) at synpase b/tw pre & post ggl neurons; also at neuromuscular jxns
-muscarinic (excitatory or inhibitory) at synapse btwn post ggl cell and effector
Term
most organs are inervated by...
Definition
parasympathetic & sympathetic divisions
-allows for homeostasis
Term
Visceral reflexes: (path of travel)
Definition
receptor--> sensory nerve--> processing-->
preganglionic fiber--> postganglionic fiber
Term
higher levels can be involved in integration and control
Definition
-medulla oblongata
-hypothalamus
(limbic system & cortex)
Term
Agonist
Definition
a drug, medicine, chemical that acts the same as a bodies chemical
e.g. caffeine acts like NE because it speeds up heart rate
Term
Antagonist
Definition
chemical, drug, medicine that does the opposite of the bodies chemical
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