Question

which of the following criteria specifically defines true ribs of the thoracic cage?
a.) no cartilaginous attachment to the sternum
b.) direct cartilaginous attachment of ribs to the sternum
c.) indirect cartilaginous attachment of ribs to the sternum through attachment to the cartilage of the next higher rib
d.) no attachment to the thoracic vertebrae

Explanation:

True ribs are defined as having a direct cartilaginous attachment to the sternum. Option a is incorrect as true ribs do have a cartilaginous connection. Option c describes false ribs. Option d is wrong as all ribs (including true ribs) attach to thoracic vertebrae.

Answer:

B. Direct cartilaginous attachment of ribs to the sternum