2.5_ The Autonomic Nervous System_ Essential Human Anatomy and Physiology II with Lab- Burtt.pdf

2/11/2020 2.5: The Autonomic Nervous System: Essential Human Anatomy and Physiology II with Lab- Burtt
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2.5: The Autonomic Nervous System
The Autonomic Nervous System
The autonomic nervous system , a part of the peripheral nervous system, is made up of motor neurons
that control the internal organs automatically and usually without need for conscious intervention. The
sensory neurons that come from the internal organs allow us to feel internal pain. The cell bodies for
these sensory neurons are in dorsal-root ganglia, along with the cell bodies of somatic sensory neurons.
The following terminology will be used for the ANS nervous system:
Preganglionic axon: (shown in red in Figure 2.47 and Figure 2.48 , below) A motor neuron cell body
is located in the spinal cord or brain. The axon synapses with a second motor neuron located in an
autonomic ganglion outside the spinal cord.
Postganglionic axon : (shown in black in Figure 2.47 and Figure 2.48 , below) After synapsing in a
in an autonomic ganglion, the axon of the ganglionic motor neuron synapses on an effector organ in
the peripheral nervous system.
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2/11/2020 2.5: The Autonomic Nervous System: Essential Human Anatomy and Physiology II with Lab- Burtt
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