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| 61. | sympathetic chain ganglia | series of ganglia adjacent to the vertebral column that receive input from central sympathetic neurons |
| 62. | sympathetic division | division of the autonomic nervous system associated with the fight-or-flight response |
| 63. | sympatholytic drug | drug that interrupts, or "lyses," the function of the sympathetic system |
| 64. | sympathomimetic drug | drug that enhances or mimics the function of the sympathetic system |
| 65. | target effector | organ, tissue, or gland that will respond to the control of an autonomic or somatic or endocrine signal |
| 66. | terminal ganglia | ganglia of the parasympathetic division of the autonomic system, which are located near or within the target effector, the latter also known as intramural ganglia |
| 67. | thoracolumbar system | alternate name for the sympathetic division of the autonomic nervous system that is based on the anatomical location of central neurons in the lateral horn of the thoracic and upper lumbar spinal cord |
| 68. | varicosity | structure of some autonomic connections that is not a typical synaptic end bulb, but a string of swellings along the length of a fiber that makes a network of connections with the target effector |
| 69. | vasomotor nerves | preganglionic sympathetic fibers that cause the constriction of blood vessels in response to signals from the cardiovascular center |
| 70. | visceral reflex | reflex involving an internal organ as the effector, under the control of the autonomic nervous system |
| 71. | white rami communicantes | (singular: ramus communicans) myelinated structures that provide a short connection from a sympathetic chain ganglion to the spinal nerve that contains the preganglionic sympathetic fiber |
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