EXSC 213 Human Anatomy Peripheral Nerve Lab: Spinal Nerves A Case of Spinal Cord

Question

EXSC 213 Human Anatomy Peripheral Nerve Lab: Spinal Nerves A Case of Spinal Cord Injury Jason Hendrix is a 21 year-old senior at the University of the Twin Cities, majoring in exercise science. On a warm and sunny spring afternoon, Jason was involved in a one-vehicle motorcycle accident. In the accident, Jason was thrown from his bike to the pavement, landing on his back. A police officer 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 Regions Hospital When he arived 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 revealed the following: radial muyucu Jason demonstrated normal or near normal strength in flexing and extending his elbows, extending his wrists, and when flexing his middle finger and abducting his little nerve finger on both hands. unar radia urve . He exhibited no movement when medical personnel tested his ability to flex his hips extend his knees, and dorsiflex his ankles. ?s,M) Stretch reflexes involving the biceps, brachioradialis, and triceps muscles were found to be normal, while those involving the patella and ankle were absent. . Jason was found to have normal sensitivity to pin prink and light touch in areas of his body above the level of his inguinal (groin) region, but not below that region of the body. IAwEr Epinal corc Lowert Questions 1. Define the term spinal cord injury (SCI) and state its prevalence. 2. Define the terms reflex and spinal reflex, and identify the components of a reflex arc. 3. Define the terms neurological level, tetraplegia, and paraplegia. Adapted from the National Center for Case Study Teaching in Science

Explanation / Answer

Ans1. Spinal cord injury is the damage to spinal cord which result in temporary or permanent changes in its function. Their is impairment of function below the level of injury.

Ans2. A reflex is an involuntary movement in response to any stimulus.

A spinal reflex is a withdrawal reflex in response to any nocioceptive stimulus.

Components of reflex arc are: receptor, sensory neuron, motor neuron, interneuron and effector.

Ans3.Neurological level refers to the caudal segment of spinal cord where sensory and motor functions are intact.

Quadreplegia:It refers to complete paralysis of all four extremities and trunk.

Paraplegia: It refers to complete paralysis of both lower extremities.

Ans4. Dermotome is an area of the skin supplied by single spinal nerve.Below the level of SCI sensation of pain and touch are lost.

Myotome is a group of muscle supplied by single spinal nerve. All the motor functions below the level of injury are impaired.

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