. Human physiology : designed for colleges and the higher classes in schools, and for general reading. FIG. 169. The change of action in the formative vessels, which iasometimes called for by accident and disease, exhibits in an in-teresting manner the concert between these vessels as in-fluenced by circumstances. When a bone is broken, theseformative vessels set themselves to work to repair the injury,by forming new bone between and around the two ends , which new bone we call callus. In this case, the bone-builders extend their range of operations to meet the newnecessity ; and i
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. FIG. 169. The change of action in the formative vessels, which iasometimes called for by accident and disease, exhibits in an in-teresting manner the concert between these vessels as in-fluenced by circumstances. When a bone is broken, theseformative vessels set themselves to work to repair the injury,by forming new bone between and around the two ends , which new bone we call callus. In this case, the bone-builders extend their range of operations to meet the newnecessity ; and in doing so they maintain the same concertwhich marked their usual operations before the bone wasbroken. I stated in § 105, that when an artery is tied, tocure an aneurism, the circulation in the limb is kept up by thesmall arteries that go off from it above the ligature, communi-cating with those that branch off below; and that, in order tomake the circulation perfect, some of these communicatingarteries gradually enlarge, to meet the necessities of the caseNow, this enlargement is not a mere dilatation pr
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