system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Two days after undergoing an emergency laparotomy following a motor vehicle collision, a 37-year-old man has increased thirst. Examination shows dry mucous membranes and decreased skin turgor. A review of his chart shows his urine output to be in excess of his fluid intake. Laboratory studies show a serum sodium concentration of 151 mEq/L and urine osmolality of 110 mOsmol/kg H2O. One hour after the administration of desmopressin, the serum sodium concentration is 146 mEq/L and urine osmolality is 400 mOsmol/kg H2O. One week later, his laboratory values are within normal limits. This patient's condition was most likely caused by damage to which of the following structures?
assistant
Posterior pituitary