The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . ieties of bone are composedentirely of the spongy (or cancel-lous) tissue, with a thin layer ofhard, compact tissue on the sur-face. i6. The Periosteum and theMinute Structure of Bone.—Allthe bones are covered with avery tough, strong, fibrous , called tho, periosteum, ex-cepting at the parts which enterinto the formation o
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . ieties of bone are composedentirely of the spongy (or cancel-lous) tissue, with a thin layer ofhard, compact tissue on the sur-face. i6. The Periosteum and theMinute Structure of Bone.—Allthe bones are covered with avery tough, strong, fibrous , called tho, periosteum, ex-cepting at the parts which enterinto the formation of the joints,where they are covered withFig. 6.—The right femur, Cartilage. This membrane ad-or thi-h-bone, sawn in hercs SO closcly to the bonc as to two lenslhwise. Notice . ^ ^ ^ r r the arrangement of the fcquirc Considerable forcc forbony fibers at the upper its Separation. It sccms to f orm end, its pecuharity be- ^ -^ ^f ^^iQ boUC. NoW, thc ing somewhat exagger- . , , r ated so as to make it periostcum and the marrow of more plain. the boucs are necessary to their growth and nourishment. The blood-vessels and nerves spread and divide in these tissues before entering the actual substance of the bone. The bone itself is full of minute channels and. BONES,—GENERAL STRUCTURE. tubes varying in size from ^^ to the -gu-roT of aninch in diameter, through which the blood cir-culates, and the smallest of these tubes are con-nected at one end with exceedingly minute cavi-ties in the bone, in each of which lies a little cell,which does the work of nourishing, repairing, and enlarging the bone(Fig. 7). Thus wesee that, even in sohard and firm a tis-sue as bone, whathas been said aboutcells holds are the reallife of the bone;they separate fromthe blood the neces-sary material anddeposit it aroundthemselves, some-what as a crab re-news his shell eve-ry year after get-ting rid of the Uses of the Periosteum.—It has long beenknown that, when the periosteum is
Size: 907px × 2756px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booksubjecthumananato, booksubjecthygiene, booksubjectphysiology
