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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    makes for lightness without sacrificing strength. The spaces are filled with red bone-marrow and blood-vessels. It must be remembered that in life all bone contains blood- vessels ; so whenever bone is broken there is always bleeding. » PERIOSTEUM SH _EPIPHYSIAL LINE ee Mtv” CANCELLOUS ANY wt TISSUE COMPACT TISSUE MEDULLA CR MARROW Fic. 7.—SECTION THROUGH THE UPPER END OF THE FEMUR SHOWING COMPACT AND CANCELLOUS BONE, MEDULLARY CAVITY, CARTILAGE AND PERIOSTEUM. 16. Development of bone.—At birth many of the bones consist mainly of cartilage, which is gradually converted into bone by the deposition of lime salts (ossification). This process is not complete in all the bones until the age of 25. Growth of long bones takes place near the ends, at the epiphysial line (Fig. 7). In young people this area is hable to disease and injury, which may result in stunting or irregular growth of the limb. 17. Cartilage, or gristle, is a tough, smooth, flexible, blood- less substance found in various situations where a certain amount of elasticity is useful. Thus the ribs are connected to the breast-bone (sternum) by cartilage, and it enters into the external ear, the nose and the windpipe. Cartilage is also found where a smooth finish is required—as on the ends of bones forming joints. Though not readily broken, it can be cut with a sharp knife. 18. Ligaments are strong white inelastic fibrous bands which bind the bones together (Fig. 8). Though they keep them close together and prevent them from slipping out of place, they allow movement in certain directions.