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Automatic Nervous System (ANS)
BIOL 207-Exam 3 for Dr. Anderson
13
Anatomy
Undergraduate 1
03/18/2015

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Term
autonomic nervous system (ANS) (involuntary nervous system or general visceral motor system)
Definition
consists of motor neurons; innervate smooth and cardiac muscle and glands; make adjustments to ensure optimal support for body activities; operate via subconscious
Term
dual innervation
Definition
all visceral organs served by both divisions, but cause opposite effects
Term
parasympathetic
Definition
long then short nerves; targeted effects; promotes maintenance activities and conserves body energy
Term
sympathetic
Definition
short then long nerves; fans out; body wide effects; mobilizes body during activity; exercise, excitement, emergency, embarrassment
Term
long preganglionic fibers
Definition
parasymphathetic division; from brain stem and sacrum; extend from CNS almost to target organs
Term
white rami communicantes; symphathetic trunk
Definition
preganglionic fibers pass through _________________ and enter _______________
Term
sympathetic pathways to the head
Definition
innervate skin and blood vessels of the head; stimulate dilator muscles of the iris; inhibit nasal and salivary glands; innervate smooth muscle of upper eyelid; branch to the heart
Term
sympathetic pathways to the thorax
Definition
these fibers innervate heart via the cardiac plexus, thyroid gland and the skin; lungs and esophagus
Term
sympathetic pathways to the abdomen
Definition
these fibers innervate the stomach, intestines, liver, spleen, and kidneys
Term
sympathetic pathways to the pelvis
Definition
these fibers innervate postganglionic fibers serve the distal half of the large intestine, the urinary bladder, and the reproductive organs; primarily inhibit activity of muscles and glands in abdominopelvic visceral organs
Term
cholinergic fibers
Definition
neurotransmitter; release ACh; All ANS preganglionic axons; all parasympathetic postganglionic axons at effector synapse; two types of receptors Nicotinic and Muscarinic
Term
adrenergic fibers
Definition
neurostransmitter; release NE; most sympathetic postganglionic axons; multiple types of receptors in two families alpha and beta
Term
atropine
Definition
blocks parasympathetic effects; an "Anti-Muscarinic"; makes body look like in sympathetic event
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