465.Internal bleeding can be a rare complication of a broken clavicle if
the broken bone fragment becomes significantly displaced and tears a ves-
sel and punctures the pleura. Normally the subclavius muscle protects the
underlying vessels. Which of the following vascular structures is particu-
larly vulnerable in a displaced clavicular fracture?
a. Subscapular artery
b. Cephalic vein
c. Lateral thoracic artery
d. Subclavian vein
e. Thoracocervical trunk
466.A 72-year-old woman trips over the edge of the carpet and falls for-
ward onto the floor. A common reflex reaction to tripping and falling for-
ward is to extend ones hands to ease the impact of striking the floor. She
presents to the emergency room holding her left arm with her right hand.
There is an obvious posterior displacement of the left distal wrist and hand
that looks like a dinner fork. What type of fracture is this called and what
bone(s) is/are likely involved?
a. Colles’ fracture; always the ulna and sometimes the radius
b. Colles’ fracture; always the radius and sometimes the ulna
c. Colles’ fracture; always the ulna and sometimes the scaphoid
d. Colles’ fracture; always the radius and sometimes the trapezium
467.A 36-year-old man fell while playing soccer 1 week earlier. He fell on
his left hand and didn’t think he broke anything, but he has a palmar mass
and has weakened ability to grasp with that hand and has developed some
tingling in his thumb and index finger. He has no pain when you press in
the anatomical snuffbox. Which of the following carpal bones is most likely
dislocated anteriorly and causing a form of carpal tunnel syndrome?
a. Capitate
b. Hamate
c. Lunate
d. Navicular
e. Scaphoid
566 Anatomy, Histology, and Cell Biology