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The lung on the right side of the thorax, called the right lung, is made up of three divisions, or lobes, and the left lung is made up of two lobes. Each lobule receives a distinct division of an air tube and has in itself the structure of a miniature lung. The right lung shows the lobes and their divisions, the lobules. The tissue of the left lung has been dissected away to show the air tubes.
The tissue that forms them is light, will float in water, is elastic and somewhat rose-colored. Each lung is divided into lobes, and each lobe into a great number of lobules by the supporting connective tissue. The lobule is the smallest division of the lung and is formed by capillary bronchial tubes, air cells and blood-vessels.
It may be large and soft, or even smaller than normal. The liver may be enlarged and dark, or mottled and light colored. The stomach and intestines may show hemorrhagic spots and blotches. Sometimes the gastric and intestinal mucous membrane is a brick red. Scattered lung lobules or a large portion of the lungs may be inflamed.
"Yet I ought not to disparage him unduly, for he was the one specimen in my collection, up to that time, who presented the orthodox 'stigmata of degeneration. His hair was bushy, his face strikingly asymmetrical, and his ears were like a pair of Lombroso's selected examples; outstanding, with enormous Darwinian tubercles and almost devoid of lobules.
The various lobes and lobules are taken to represent the various districts concerned in the question on which light is desired, and according to the strength and intimacy of the connections between these lobes, the people of the districts represented are held to be bound in more or less lasting friendship.
After the blood has been robbed of its bile-making materials, it is collected by the veinlets that surround the lobules, and finds its way with other venous blood into the hepatic vein. In brief, blood is brought to the liver and distributed through its substance by two distinct channels, the portal vein and the hepatic artery, but it leaves the liver by one distinct channel, the hepatic vein.
On entering the liver this great vein conducts itself as if it were an artery. It divides and subdivides into smaller and smaller branches, until, in the form of the tiniest vessels, called capillaries, it passes inward among the cells to the very center of the hepatic lobules. The Bile.
In like manner countless numbers of these lobules, bound together by connective tissue, are grouped after the same fashion to form by their aggregation the lobes of the lung. The right lung has three such lobes; and the left, two. Each lobule has a branch of the pulmonary artery entering it, and a similar rootlet of the pulmonary vein leaving it.
The work is done by the arterial blood brought to it by a great branch direct from the aorta, known as the hepatic artery, minute branches of which in the form of capillaries, spread themselves around the hepatic lobules.
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