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The trachea and bronchial system provide the passageway for air to
move in and out of the lungs. The basic divisions are:
- The trachea, a cartilaginous and membranous tube,
about 2.5 cm (1 in.) in diameter and 11
cm. (4.3 in) long. It begins at the lower part of the larynx and
descends behind the arch of the
aorta where it divides into left and right primary bronchi.
- The bronchial system, which begins at the division of
the trachea into the two primary bronchi. The
bronchi will continue to divide into smaller branches until
reaching areas where gas exchange
(respiration) can take place.
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See
this slide with the virtual
microscope