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24 Cards in this Set

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What is a motor system - an involuntary motor system, i.e. needs no conscious control.
Autonomic Nervous System (ANS)
Each "functional unit" consists of ___ ___ in series conducting from the CNS to the periphery.
two neurons
The 1st neuron whose cell body is located in the brain or in the spinal cord and extends to a peripheral ganglion is called a
preganglionic neuron
The second neuron is located somewhere outside the brain and the spinal cord and is called a
postganglionic neuron
One can divide the ANS on the basis of how the preganglionic fibers leave the CNS:
1.Fibers leaving the CNS with cranial nn. (III, VII, IX, X); 2.Fibers leaving the CNS with the thoracic and lumbar spinal nn.(T1 to L2 or L3); 3.Fibers leaving the CNS with the sacral spinal nn.(S2, 3, 4).
is grouped together because of their anatomical similarity and is spoken of as the___ division of the ANS.
sympathetic
is grouped together because there is similarity in location of their ganglia (at the site of the organ innervated). In general, (1) and (3) are anatomically similar and are referred to as the ___ division of the ANS.
parasympathetic
What are the principal differences between parasympathetic & sympathetic divisions?
Parasympathetic ganglia are located in or very close to the organs they innervate. They have long preganglionic cells and short postganglionic cells. Sympathetic ganglia are located in the sympathetic trunk and are located at some distance from the organs they innervate. Hence, they have short preganglionic cells and long postganglionic cells (except, splanchnic nn.).
___ ganglia are located in the sympathetic trunk and are located at some distance from the organs they innervate. Hence, they have___ preganglionic cells and ___ postganglionic cells (except, splanchnic nn.).
sympathetic; short; long
___ ganglia are located in or very close to the organs they innervate. They have ___ preganglionic cells and ___ postganglionic cells.
Parasympathetic; long; short
Target organs =
organs which postganglionic neurons innervate
The target organs of the ANS are:
smooth mm., cardiac m., and glands.
Functions of sympathetic
fight or flight functions e.g.- dilate blood vessels in skeletal mm.; constrict blood vessels in gut; dilate pu;il; stimulates sweat glands; increases heart rate
Functions of parasympathetic
vegetative e.g. - peristalsis - opposite of sympathetic
Arises from T1 - L2.
sympathetic
Preganglionic fibers are
myelinated
Postganglionic fibers are
unmyelinated
what system is also organized on basis of pre- and postganglionic neurons.
parasympathetic
In the parasympathetic nervous system The ____ neurons leave the CNS with cranial nn. III, VII, IX, X or sacral nn. of the spinal cord.
preganglionic
In the parasympathetic nervous system the ____ axons merge as a component of a cranial n. or as a part of the anterior root of a sacral n.
preganglionic
preganglionic axons of the ___ leave the nerve with which they are associated and pass to organs which they innervate such as cardiac m., smooth m., and glands.
parasympathetic
___-ganglionic neuron synapse with their ___-ganglionic neurons in ganglia near or in the organ they innervate;
pre; post
___ ganglia are not regularly spaced as are the ___ ganglia of the sympathetic trunk.
parasympathetic; sympathetic
Many ___ ganglia are of microscopic size
parasympathetic