How might a surgeon differentiate between the jejunum and the ileum when she is performing exploratory laparotomy?

A 51-year-old man presents in the emergency department with a complaint of sharp pain and cramping. Follow-up imaging reveals a tumor in the head and uncinate process of the pancreas. Which of the following vessels is most immediately at risk for occlusion if this tumor enlarges?

A patient presents with acute abdominal pain and fever. Examination of her abdomen reveals fluid (ascites) within the lesser sac, which is now draining into the greater peritoneal sac. Which of the following pathways accounts for the seepage of fluid from the lesser to the greater sac?

A 73-year-old woman is admitted to the hospital with significant abdominal ascites. When she sits upright on the side of her bed, the intraperitoneal fluid accumulates in her pelvis. Which of the following sites represents the lowest extent of the female abdominopelvic cavity where this fluid will collect?

A patient with a midshaft compound humeral fracture presents with bleeding and clinical signs of nerve entrapment. Which of the following nerves is most likely injured by the fracture?

A baseball pitcher delivers a 97-mph fastball to a batter and suddenly feels a sharp pain in his shoulder on release of the ball. The trainer examines the shoulder and concludes that the pitcher has a rotator cuff injury. Which muscle is most vulnerable and most likely torn by this type of injury?

A knife cut results in a deep laceration to the thoracic wall extending across the midaxillary and anterior axillary lines just above the level of the T4 dermatome to the xyphoid process. It was noted in the chart that the serratus anterior muscle was likely involved. Which of the following patient presentations would lead the emergency department physician to make that assumption about the patient?

A fracture of the first rib appears to have damaged the inferior trunk of the brachial plexus where it crosses the rib. Which of the following spinal nerve levels would most likely be affected by this injury?

During a routine physical examination, the physician notes an absent biceps tendon reflex. Which spinal cord level is associated with this tendon reflex?

Intravenous fluid administered into the median cubital vein enters the basilic vein before emptying into which of the following veins?