In a normal adult, the shape of the thorax is
a. wider from front to back than from side to side.
b. wider from side to side than from front to back.
c. the same width side to side as front to back.
d. the same in infancy and throughout adulthood.
B
In a normal adult, the shape of the thorax is wider from side to side than from front to back. The normal thorax is slightly elliptical in shape. A thorax that is the same width side to side as it is front to back is called a barrel chest and is normal in infants and sometimes in the older adult. An infant has a barrel thorax (the same width side to side as front to back). By age 6, the thorax attains the adult configuration.
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