440.A 45-year-old man was riding a snowmobile and hit a snow-covered
rocky outcropping. When standing for the first time after the accident, he
slipped and fell on the outcropping and now is experiencing pain in the
gluteal region. In this CT scan, the dark linear structure indicated by the arrow
is which of the following?
Pelvis 541a. A fracture of the sacral body
b. The sacrococcygeal joint
c. A spinal nerve
d. The superior gluteal artery
e. The inferior gluteal artery