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A patient suffers a cerebral vascular accident (stroke) which damages part of his primary motor cortex leaving his left leg paralysed. A second patient suffers an automobile accident in which his left sciatic nerve is severed, paralysing his leg. Describe and contrast the effects on the leg muscles of these two injuries, including a description of the pathways involved. Patient A is suffering from an upper motor neuron lesion due to stroke, also known as …

…Henry J.M Barnette(1986): Stroke pathophysiology, diagnosis, and management. volume 2 5. Keith Moore (1992): Clinically oriented anatomy 3rd edtion 6.Stroke : http://www.heartcenteronline.com/myheartdr/common/articles.cfm?Artid=614&startpage=8 (figure 1) 7. Corticospinal tract pathway: http://nawrot.psych.ndsu.nodak.edu/Courses/Psych465.S.02/Movement/Fig.%208-6.jpg (figure 2) 8.http://www.med.uwo.ca/physiology/courses/medsweb/ 9. Sciatic Nerve injury : http://ots.utoronto.ca/users/howardg/pn3.pdf 10.Stroke-association http://www.strokeassociation.org/presenter.jhtml?identifier=1014