. Text-book of anatomy and physiology for nurses. ite in colorlike ivory, and is called compact bone tissue. The deeper part isporous, and is therefore called spongy tissue (also named cancelloustissue, because its appearance suggests lattice work). (See Fig. 6.) Compact tissue is most abundant on the shafts of the long bones,which by their situation in the extremities are exposed to externalviolence, and therefore need especial strength for resistance. Sinceit is important that the bones be slender as well as strong, these tworesults are gained by packing the bone tissue as closely as possibl
. Text-book of anatomy and physiology for nurses. ite in colorlike ivory, and is called compact bone tissue. The deeper part isporous, and is therefore called spongy tissue (also named cancelloustissue, because its appearance suggests lattice work). (See Fig. 6.) Compact tissue is most abundant on the shafts of the long bones,which by their situation in the extremities are exposed to externalviolence, and therefore need especial strength for resistance. Sinceit is important that the bones be slender as well as strong, these tworesults are gained by packing the bone tissue as closely as possible. Cancellous tissue is more abundant in the parts of bones whereextent of surface is desirable. For example, the enlarged extremitiesof long bones are composed of cancellous tissue covered with a thin Periosteum Outer ground lamellae Haversian canals Haversian lamellae Interstitial lamellasInner ground lamellas Marrow Fig. 7.—From a Cross-Section of a ^SIetacarp of Man. X 50. The Haversiancanals contain a little marrow (fat-cells).—(Stohr.;. compact layer; thus they can give attachment to many tendons andligaments, v/hile the spongy character of the bone prevents increasein weight. The marrow of bones is contained in the spaces of cancelloustissue, where it is thin and red, and in little canals running throughthe bone substance. Under the microscope may be seen smallchannels in the compact tissue called Haversian canals, which con-tain minute vessels and a little marrow. A large canal called themedullary canal runs in the shaft of each long bone, containingfirm yellow marrow and larger vessels. lO ANATOMY AND PHYSIOLOGY FOR NURSES. Articular surface of bone is that portion which enters into theformation of a movable joint. It consists of a very compact tissuecalled the articular layer or articular lamella. Surface Markings of Bone. Any inequality of the surface of a bone, whether it be anelevation or depression, or an opening, is called a most prominent elevati
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