In the trachea, or windpipe, there are tracheal rings, also known as tracheal cartilages. Cartilage is strong but flexible tissue. The tracheal cartilages help support the trachea while still allowing ...
IN 1931, I performed an autopsy on a five-month-old baby who had had wheezing respirations since birth and had recently developed difficulty in swallowing. At this examination a ring of blood vessels ...
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