Textbook Question
Complaining of muscle weakness, Delia goes to the doctor. Devise a series of physical examination tests that would help to determine if her problem involves upper or lower motor neurons.
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Ch. 13 The Peripheral Nervous System
Chapter 13, Problem 13.11a
Place the following sequence of events for the detection of somatic sensation in the proper order. Place a 1 by the first event, a 2 by the second event, and so on.
a. ______The central process transmits the action potential to a second-order sensory neuron in the CNS.
b. ______The action potential is transferred to the central process in the posterior root ganglion.
c. ______The stimulus triggers an action potential.
d. ______The signal is transferred to other CNS sensory neurons for eventual perception and interpretation.
e. ______The action potential is propagated along the peripheral process of the neuron.
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Related Practice
Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
b. The somatic motor division of the PNS consists of lower motor neurons that directly innervate skeletal muscle fibers.
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
d. The term nerve is the equivalent of the term neuron.
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Textbook Question
How do upper and lower motor neurons differ?
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Textbook Question
List and describe the basic steps involved in producing movement, beginning with the upper motor neurons in the cerebral cortex.
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Textbook Question
The lower motor neurons that innervate contractile skeletal muscle fibers are called:
a. α-motor neurons.
b. β-motor neurons.
c. upper motor neurons.
d. γ-motor neurons.
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