Royal Army Medical Corps training pamphlet / War Office.

Date:
1944
Catalogue details

Licence: Public Domain Mark

Credit: Royal Army Medical Corps training pamphlet / War Office. Source: Wellcome Collection.

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    tibial) running down the front of the leg between the muscles to reach the front of the ankle. These two arteries meet in the sole of the foot, where they form the plantar arch; this is placed under the arch of the instep in such a position that it cannot.be compressed by the weight of the body in the standing position. Veins.—Many of the principal veins run alongside the principal arteries. On the whole, however, veins are not placed so deeply as arteries. As Fig. 19 indicates, the veins of the arm and leg form a fairly superficial network, whereas the main arteries rarely approach the surface. By clenching their fists, most people can make their arm veins fuller than usual, and it is then seen that some quite large veins le just 53. The portal circulation.—Blood going through capil-- laries in the stomach and intestine collects nourishment from the digested food in them. Such blood, instead of returning direct to the heart, is first taken through the liver, which extracts and stores any of the dissolved food it requires. To make this possible all the veins carrying blood from the alimentary canal unite to form a large vein called the portal vein, which enters the liver and divides there. After passing through the liver, the blood is gathered into the hepatic veins which take it to the inferior vena cava and so to the heart. CHAPTER 6 RESPIRATION 54. In breathing or vespivation air is drawn in through the nose—or the mouth if this is open—and passes through the throat (pharynx) into the larynx (Fig. 20). The larynx opens into the windpipe (tvachea) which divides into the right bronchus and the left bronchus going to thé two lungs. The trachea and the bronchi are kept open by rings of cartilage surrounding them. In the lungs the bronchi branch out in all directions so as to take air to every part of the lungs. 55. The lungs are two large sponge-like organs, pinkish grey in colour, which occupy most of the chest cavity. They le one on each side and have the heart between them. Each contains innumerable minute cavities, in which the’ bronchial tubes end blindly. In the partitions between these cavities there are networks of capillaries. —