Root of the lung
Upon entering the lungs, primary bronchi branch to form secondary bronchi. Large pulmonary arteries and veins lie adjacent to secondary bronchi, forming the root of the lung. In secondary bronchi, cartilage plates replace cartilage rings; mixed glands are still present. Millions of alveoli comprise the lung proper, so all intrapulmonary structures, like secondary bronchi, are surrounded by alveoli. When cut in sections, alveoli resemble tennis balls cut in half. 10x
Secondary bronchi
Upon entering the lungs, primary bronchi branch to form secondary bronchi. Large pulmonary arteries and veins lie adjacent to secondary bronchi, forming the root of the lung. In secondary bronchi, cartilage plates replace cartilage rings; mixed glands are still present. Millions of alveoli comprise the lung proper, so all intrapulmonary structures, like secondary bronchi, are surrounded by alveoli. When cut in sections, alveoli resemble tennis balls cut in half. 10x
Cartilage plates
Upon entering the lungs, primary bronchi branch to form secondary bronchi. Large pulmonary arteries and veins lie adjacent to secondary bronchi, forming the root of the lung. In secondary bronchi, cartilage plates replace cartilage rings; mixed glands are still present. Millions of alveoli comprise the lung proper, so all intrapulmonary structures, like secondary bronchi, are surrounded by alveoli. When cut in sections, alveoli resemble tennis balls cut in half. 10x
Mixed glands
Upon entering the lungs, primary bronchi branch to form secondary bronchi. Large pulmonary arteries and veins lie adjacent to secondary bronchi, forming the root of the lung. In secondary bronchi, cartilage plates replace cartilage rings; mixed glands are still present. Millions of alveoli comprise the lung proper, so all intrapulmonary structures, like secondary bronchi, are surrounded by alveoli. When cut in sections, alveoli resemble tennis balls cut in half. 10x
Pulmonary vessels
Upon entering the lungs, primary bronchi branch to form secondary bronchi. Large pulmonary arteries and veins lie adjacent to secondary bronchi, forming the root of the lung. In secondary bronchi, cartilage plates replace cartilage rings; mixed glands are still present. Millions of alveoli comprise the lung proper, so all intrapulmonary structures, like secondary bronchi, are surrounded by alveoli. When cut in sections, alveoli resemble tennis balls cut in half. 10x
Bronchioles
Upon entering the lungs, primary bronchi branch to form secondary bronchi. Large pulmonary arteries and veins lie adjacent to secondary bronchi, forming the root of the lung. In secondary bronchi, cartilage plates replace cartilage rings; mixed glands are still present. Millions of alveoli comprise the lung proper, so all intrapulmonary structures, like secondary bronchi, are surrounded by alveoli. When cut in sections, alveoli resemble tennis balls cut in half. 10x
Alveoli
Upon entering the lungs, primary bronchi branch to form secondary bronchi. Large pulmonary arteries and veins lie adjacent to secondary bronchi, forming the root of the lung. In secondary bronchi, cartilage plates replace cartilage rings; mixed glands are still present. Millions of alveoli comprise the lung proper, so all intrapulmonary structures, like secondary bronchi, are surrounded by alveoli. When cut in sections, alveoli resemble tennis balls cut in half. 10x
Image credit
This image was taken from The University of Michigan collection.
