Human Physiology
15th Edition
ISBN: 9781259864629
Author: Fox, Stuart Ira
Publisher: Mcgraw-hill Education,
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Question
Chapter 8, Problem 16RA
Summary Introduction
To review:
The definition of the term decussation and its significance in terms of pyramidal motor system.
Introduction:
The nervous system controls or regulates all body mechanisms. The nervous system contains the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and the spinal cord. The brain is the main controller of the body. The brain is divided into right hemisphere and left hemisphere. They have different points or regions for the regulation of all mechanisms.
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Chapter 8 Solutions
Human Physiology
Ch. 8 - Prob. 1CPCh. 8 - Describe the embryonic origin of the brain...Ch. 8 - Prob. 3aCPCh. 8 - Describe the locations and functions of the basal...Ch. 8 - Prob. 4aCPCh. 8 - Prob. 4bCPCh. 8 - Prob. 5CPCh. 8 - Prob. 6CPCh. 8 - Prob. 7aCPCh. 8 - Prob. 7bCP
Ch. 8 - Prob. 8aCPCh. 8 - Prob. 8bCPCh. 8 - Prob. 9CPCh. 8 - Prob. 10CPCh. 8 - Prob. 11aCPCh. 8 - List the tracts of the extrapyramidal system and...Ch. 8 - Prob. 12aCPCh. 8 - Prob. 12bCPCh. 8 - Prob. 1RACh. 8 - Prob. 2RACh. 8 - Prob. 3RACh. 8 - Prob. 4RACh. 8 - Prob. 5RACh. 8 - Prob. 6RACh. 8 - Prob. 7RACh. 8 - Prob. 8RACh. 8 - Prob. 9RACh. 8 - Prob. 10RACh. 8 - Prob. 11RACh. 8 - Prob. 12RACh. 8 - Prob. 13RACh. 8 - Prob. 14RACh. 8 - Prob. 15RACh. 8 - Prob. 16RACh. 8 - Prob. 17RACh. 8 - The thalamus has been described as a...Ch. 8 - Prob. 19RACh. 8 - Prob. 20RACh. 8 - Prob. 21RACh. 8 - Prob. 22RACh. 8 - Prob. 23RACh. 8 - Prob. 24RACh. 8 - State two reasons why researchers distinguish...Ch. 8 - Describe evidence showing that the hippocampus is...Ch. 8 - Prob. 27RACh. 8 - Prob. 28RACh. 8 - Prob. 29RACh. 8 - Recent studies suggest that medial temporal lobe...Ch. 8 - Much has been made (particularly by left-handers)...Ch. 8 - Prob. 32RACh. 8 - Prob. 33RACh. 8 - Neurologists have noticed that patients with...Ch. 8 - Prob. 35RACh. 8 - Prob. 36RACh. 8 - Table 7.3 (chapter 7) provides the axon diameters...Ch. 8 - Prob. 38RACh. 8 - Prob. 39RACh. 8 - Table 7.3 (chapter 7) provides the axon diameters...
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- Describe the structure and function of the pyramidal and extrapyramidal motor tracts.arrow_forwardList the tracts of the extrapyramidal system and explain how this system differs from the pyramidal motor system.arrow_forwardA patient with a cerebral lesion exhibits loss of fine motor control ofthe left hand, arm, forearm, and shoulder. All other motor and sensoryfunctions appear to be intact. Describe the location of the lesion asprecisely as possiblearrow_forward
- An injury to the superior portion of the primary motor cortex would affect the ability to control muscles of which parts of the body?arrow_forwardCompare the locations and functions of the direct and indirect motor pathways.arrow_forwardExplain the descending pathway from the brain where Mr. Dexter decides to move his right leg to the actual movement of his quadriceps. (Use complete sentences.) Use key words in this order: primary motor cortex in precentral gyrus, frontal lobe, descending tract, decussate, ventral horn with motor neuron in lumbar spinal cord, ventral root, spinal nerve, sciatic nerve in lumbosacral plexus, muscles to move leg (ie. quadriceps)to take a step.arrow_forward
- Higher motor commands originate in all the following centers, except :-a- cerebral cortexb- thalamusc- caudate nucleusd- cerebellumarrow_forwardHypertonia of UMN lesions is characterized by :-a- increased inhibitory discharge from the premotor areab- inhibition of pontine reticular formationc- increased γ-motor neuron discharge d- decreased muscle spindle dischargearrow_forwardThe primary motor area projects efferent fibers to all the following centers, except :-a- 1ry somatic sensory areab- premotor area c- supplemental motor aread- brainstem motor nucleiarrow_forward
- Central pattern generators (CPGs) are found at the segmental level of motor control. (a) What is the job of the CPGs? (b) What controls them, and where is this control localized?arrow_forwardInterneurons can act as “switches” that enable a movement to be turned on or off under the command of higher motor centers. How? Explain with an example?arrow_forwardLower motor neuron lesions cause all the following, except :-a- decreased number of transmitter receptors in the denervated muscleb- atrophy of the denervated musclec- flaccid paralysis of the denervated muscled- loss of flexion withdrawal reflexarrow_forward
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