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?

The sternal angle (of Louis) is an important clinical surface landmark on the anterior chest wall, dividing the thorax into the superior and inferior mediastinum. Which of the following features also is found at the level of the sternal angle?

During a routine lumbar puncture to sample the CSF, which of the following ligaments normally would be penetrated by the spinal needle?

The most common site of a hip fracture in an elderly person is the anatomical neck of the femur.

Following an accident at home when she walked into a coffee table, a 59-year-old woman presents with footdrop and a weakened ability to dorsiflex and evert her foot at the ankle. Which of the following nerves has she most likely injured?

The rupture of an aneurysm in an artery of the Circle of Willis results in significant bleeding into which of the following spaces?