Review Question - QID 210817

A 12-year-old boy follows up with his primary care physician for ongoing management of a urinary tract infection. He recently started middle school and has been having a difficult time navigating the school since he ambulates with leg braces and crutches. Consequently, he has not had sufficient time to use his urinary catheter appropriately. Otherwise, he has been unchanged from the previous visit with both sensory and motor defects in his lower extremities. He has had these defects since birth and has undergone surgeries to repair a bony defect in his spine with protrusion of a membrane through the defect. During what days of embryonic development did the defect responsible for this patient's symptoms most likely occur?