Problem: A 25-year-old maA 15-year-old boy presents to the nurse practitioner with polyuria, polydipsia, and weight loss. The NP diagnosis diabetic ketoacidosis resulting from undiagnosed type 1 diabetes mellitus (T1DM). What is the pathophysiology underlying T1DM? Need Online Tutoring? complains of a sharp pain in the lower back. He has difficulty walking on his heels and has associated weakness in the extensors of the big toes. Which of the lumbar nerves is possibly associated with these symptoms?