Case 3: Question 1

A 46-year-old man complained of radiating pains in his legs and back. He said both legs were very sensitive to touch. Examination revealed only the following (there was no weakness; pain sensation was not tested):

• bilateral loss of vibratory sense and proprioception in both lower extremities
• bilateral loss of knee and ankle reflexes
• wide-based gait with slapping of the feet to the ground
• urine retention

Question 1: Which of the major long tracts are involved?