Which of the following statements is true regarding the ribs?
a. Ribs 11 and 12 are considered false ribs, because they attach indirectly to the sternum through the cartilages of the eighth and 10th ribs.
b. The lateral portion of the tubercle of the rib articulates with the transverse process to form the costotransverse joint.
c. The crest of the head of a typical rib articulates with the intervertebral disc above.
d. The subclavian vessels and a portion of the brachial plexus create a groove on the inferior surface of the first rib.
ANS: C
There are 12 pairs of ribs. The first through the seventh ribs are known as "true" ribs, because their
cartilages attach directly to the sternum. The eighth to 10th ribs articulate with the sternum via the
costal cartilages from above them and are referred to as "false" ribs. The 11th and 12th ribs are
"floating" ribs, because they have no attachment to the sternum. Besides the costovertebral joint
mentioned above, the ribs articulate with the transverse process of the vertebrae forming what is
known as the costotransverse joint. The joint involves the articulation of the medial portion of the
tubercle of the rib with the transverse process of the corresponding vertebrae.
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