Frank evidently suffered a cerebrovascular accident (CVA), otherwise known as a "stroke." The obstruction of blood flow in a cerebral artery damaged part of the precentral gyrus (motor cortex) in the left hemisphere. Since most corticospinal tracts decussate in the pyramids, this caused paralysis on the right side of his body. His spinal nerves were undamaged, so his knee-jerk reflex was intact. The damage to the left cerebral hemisphere apparently included damage to Broca's area, producing a characteristic aphasia that accompanied the paralysis of the right side of his body.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.