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Tutorial on ascending and descending tracts
 

Tutorial on ascending and descending tracts

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For first year medical/dental students

For first year medical/dental students

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    Tutorial on ascending and descending tracts Tutorial on ascending and descending tracts Document Transcript

    • Tutorial on Ascending and descending tracts Nervous system- BS 1206 Draw a labeled diagram to illustrate the main sensory and motor pathways (tracts) of a cross section of the spinal cord, at 6th cervical vertebral level. (100 marks) 1. A patient was admitted to the hospital after an accident. He was found to have a fracture dislocation of T7 vertebra and damage to the spinal cord. On examination he had A. An upper motor neuron paralysis of the left leg B. Loss of muscle joint sensation of the left leg C. Total analgesia, thermoanesthesia on the skin of the abdominal wall below the umbilicus and the right leg. Using your knowledge on neuroanatomy answer the following giving reasons. 2.1 State the level at which the spinal cord was damaged. (10 marks) 2.2 Was the spinal cord completely sectioned or hemi sectioned. (10 marks) 2.3 State the affected side of the spinal cord. (10 marks) 2.4 Name the affected ascending and descending tracts (20 marks) 2.5 Explain the anatomical basis for the above clinical symptoms (A, B, C), explaining the related nerve conduction pathways. (50 marks) 2. Naming the nerves/tracts involved, trace the path taken by the 2.1 Pain fibers originated from the skin over the angle of the right side of the mandible to the cerebral cortex. (50 marks) 2.2 Motor fibers to the muscles in the 5th intercostals space of the right side. (50 marks)