By David F. Dean, Department of Biology, Spring Hill College Case Presentation Jason Hendrix is a ?? -year-old senior at the University of Delaware, majoring in economics. While on spring break in Florida, Jason was involved in a onevehicle motorcycle accident. In the accident, Jason was thrown from his bike to the pavement, landing on his back. A police o? cer witnessed the accident and immediately called for medical assistance.
Emergency personnel arrived within minutes, and upon recognizing the seriousness of Jason’s back injury, immobilized his neck and secured him to a rigid board prior to transporting him to the emergency room of the nearest hospital. When he arrived at the hospital, Jason was conscious and complained of pain in his lower back. Upon examination by the emergency room personnel, Jason was found to have numerous abrasions and contusions, and loss of both sensation and motor control of his legs.
After he was stabilized, a complete neurological exam was performed to assess and localize Jason’s injury. The neurological exam revealed the following: Jason demonstrated normal or near normal strength in ? exing and extending his elbows, extending his wrists, and when ? exing his middle ? nger and abducting his little ? nger on both hands. However, he exhibited no movement when medical personnel tested his ability to ? ex his hips, extend his knees, and dorsi? ex his ankles.
Stretch re?exes involving the biceps, brachioradialis, and triceps muscles were found to be normal, while those involving the patella and ankle were absent. In addition, Jason was found to have normal sensitivity to pin prick and light touch in areas of his body above the level of his inguinal (groin) region, but not below that region of the body. Questions ?. Describe the functional anatomy of the spinal cord using the following terms: white matter, gray matter, tracts, roots, and spinal nerves. ?.
De?ne the terms re? ex and spinal re? ex, and identify the components of a re? ex arc. ?. De? ne the term spinal cord injury (sci) and state its prevalence. ?. De? ne the terms neurological level, tetraplegia, and paraplegia. ?. De? ne the terms dermatome and myotome and explain how each relates to sci. ?. De? ne the term stretch re? ex and describe how such re? exes are used to anatomically localize sci. ?. Based upon the results of Jason’s neurological exam, what is the neurological level of his sci? ?.
Discuss the management of sci and the factors that determined the prognosis for this condition. Image Credit: Detail of The Injured Mason by Francisco de Goya, ???? –??. Oil on canvas. Museo del Prado, Madrid, Spain. Copyright © ???? by the National Center for Case Study Teaching in Science. Originally published ?? /?? /?? at http://www. sciencecases. org/spinal_cord/spinal_cord. asp Please see our usage guidelines, which outline our policy concerning permissible reproduction of this work. “A Case of Spinal Cord Injury” by David F.