A 42-year-old physician was involved in a skiing accident and suffered a spinal cord injury. he was brought by ambulance to the emergency room, where observation indicated he might have suffered damage to the lumbosacral region of the spinal cord. the attending physician performed a variety of simple tests to localize the level of the lesion precisely. the physician first checked for cutaneous sensation on the sole of the foot. if the patient were able to extend his right leg but not flex the same leg, damage to which of the following segments would be indicated?

A 42-year-old physician was involved in a skiing accident and suffered a spinal cord injury. he was brought by ambulance to the emergency room, where observation indicated he might have suffered damage to the lumbosacral region of the spinal cord. the attending physician performed a variety of simple tests to localize the level of the lesion precisely. the physician first checked for cutaneous sensation on the sole of the foot. if the patient were able to extend his right leg but not flex the same leg, damage to which of the following segments would be indicated?

A 42-year-old physician was involved in a skiing accident and suffered a spinal cord injury. he was brought by ambulance to the emergency room, where observation indicated he might have suffered damage to the lumbosacral region of the spinal cord. the attending physician performed a variety of simple tests to localize the level of the lesion precisely. the physician first checked for cutaneous sensation on the sole of the foot. if the patient were able to extend his right leg but not flex the same leg, damage to which of the following segments would be indicated?


A. t10 to t12
B. l2 to l4
C. l3 to s4
D. s5
E. coccygeal

Answer: C. l3 to s4


Anatomy

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