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. the physician then checked for extension of the leg at the knee joint. inability to extend the leg would most likely indicate damage to which of the following spinal segment(s)?

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. the physician then checked for extension of the leg at the knee joint. inability to extend the leg would most likely indicate damage to which of the following spinal segment(s)?

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. the physician then checked for extension of the leg at the knee joint. inability to extend the leg would most likely indicate damage to which of the following spinal segment(s)?



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

Answer: B. l2 to l4


Anatomy

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