The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . Fig. The femur. THE SKELETON. 17:;. Fig. 63. Side view of the bones ofthe foot, naturally arranged in the formof an arch. side of the leg. The patella, or knee pan, protects theknee in front. Bones of the Foot. The bones of the foot are so unitedthat they form an arch, of which only the front and the back touch the ground. This arch is useful in protecting the body from severe shocks, as in the act of running or jumping; for it is evi-dent that when the weight of the body is thrown upon the arch,
The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . Fig. The femur. THE SKELETON. 17:;. Fig. 63. Side view of the bones ofthe foot, naturally arranged in the formof an arch. side of the leg. The patella, or knee pan, protects theknee in front. Bones of the Foot. The bones of the foot are so unitedthat they form an arch, of which only the front and the back touch the ground. This arch is useful in protecting the body from severe shocks, as in the act of running or jumping; for it is evi-dent that when the weight of the body is thrown upon the arch, its center is pressed downward, thus acting as a spring. The Joints. Whenever bones form ajoint they are covered with a layer ofhighly polished cartilage. This givessome slight elasticity, and also reducesthe friction. Covering the cartilage is avery thin membrane which is constantlysecreting, or pouring out, a watery fluid,called the synovial fluid, or joint serves the same purpose as does oilto the wheels and joints of machinery. The Ligaments. The bones are held to-gether at the joints by bands of tissue,called liga
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
