. Public School Physiology and Temperance. Fig. 4.—A thin slice of bone highly magnified, showing little central canals for theblood-vessels, and tiny tubes for the passage of nutriment to the bone tissue. Theblack specks are little cavities in the bone. If we examine a thin slice of bone under the microscope,we find it is mapped out into a number of circular districts,and in the centre of each district is a small canal for thepassage of a minute blood-vessel. These canals do not runparallel with each other, or with the shaft of the bone. Some THE BONES. 19 open into khe marrow, and receive th
. Public School Physiology and Temperance. Fig. 4.—A thin slice of bone highly magnified, showing little central canals for theblood-vessels, and tiny tubes for the passage of nutriment to the bone tissue. Theblack specks are little cavities in the bone. If we examine a thin slice of bone under the microscope,we find it is mapped out into a number of circular districts,and in the centre of each district is a small canal for thepassage of a minute blood-vessel. These canals do not runparallel with each other, or with the shaft of the bone. Some THE BONES. 19 open into khe marrow, and receive their blood-vessels from it,while others open on the surface beneath the periosteum, andadmit blood-vessels. Each canal is the centre of a complete system of bloodsupply to the district. Little tubes run outwards, like spokesfrom a wheel, communicating with each other and with numer-ous other cavities (seen in Fig. 4, as black specks) in such away as to carry the blood to every part of the bone. 6. Growth and Repair of Bone.—The system
Size: 1097px × 2278px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
