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To allow room for the esophagus
anteriorly
The trachea, commonly called the windpipe, is the opening adjacent to the esophagus opening, that leads to the lungs. The cartilage rings are incomplete to allow proper collapsing, so that food can go down the right pipe.
The rings are to keep the trachea open but they are not complete posteriorly because the esophagus runs there. The soft space allows the esophagus to fully expand when food is passed down to the stomach.
incomplete
The trachea, commonly called the windpipe, is the opening adjacent to the esophagus opening, that leads to the lungs. The cartilage rings are incomplete to allow proper collapsing, so that food can go down the right pipe.
Neptune's rings are incomplete because they have less material than Saturn.
The tracheal rings of the fetal pig are complete, not incomplete circles. The tracheal rings help to keep the airways open.
In a pig's trachea, the cartilaginous rings are complete upon birth. In men and women, the cartilaginous rings are not complete.
The trachea is reinforced with cartilaginous rings in order to retain the shape while breathing and the rings are incomplete to allow the trachea to expand and move when food passes through the esophagus and while bending the neck.
The tracheal rings of the fetal pig are complete, not incomplete circles. The tracheal rings help to keep the airways open.
The cartilaginous rings in a pigs trachea are incomplete. These rings are responsible for supporting the trachea of the pig when it breathes in and out. Without these rings the pig would be in danger of having their throat collapse.