. Quain's elements of anatomy . are seen lying between the lamellte, their canaliculi piercing the lamelios. Perforating fibres.—It was further shown by Sharpey that inmany instances the lamellse are perforated by fibres, which passthrough them in a perpendicular, or obhque direction, and, as itwere, bolt them together. These perforating fibres may be seen, withthe aid of the microscope, in a thin transverse slice of a decalcifiedcylindrical or cranial bone, on pulling asunder the sections of thelamellae (as in fig. 96). In this way some lamella! will generallybe observed with fibrous processe
. Quain's elements of anatomy . are seen lying between the lamellte, their canaliculi piercing the lamelios. Perforating fibres.—It was further shown by Sharpey that inmany instances the lamellse are perforated by fibres, which passthrough them in a perpendicular, or obhque direction, and, as itwere, bolt them together. These perforating fibres may be seen, withthe aid of the microscope, in a thin transverse slice of a decalcifiedcylindrical or cranial bone, on pulling asunder the sections of thelamellae (as in fig. 96). In this way some lamella! will generallybe observed with fibrous processes attached to them (fig. 90, If) ofvarious lengths, and usually tapering and pointed at their free ex-tremities, but sometimes truncated—probably from having beendivided by the knife. These fibres have obviously been drawnout from the adjacent lamellse, through several of which they musthave penetrated. Sometimes, indeed, indications of perforations maybe recognised in the part of the section of bone from which the Fig. ..utS-^^-^^^^^ ^^^^^^^^^^ a .^...Jt Fig. 94.—Lajiell-e torn off from a decalcified human parietal bone at someDEPTH from the SURFACE (Sharpey). a, lamellaj, showing decussating fibres ; h, h, thicker part, where several lamelhe aresuperposed ; c, c, perforating fibres. Apertures through which perforating fibres hadpassed, are seen especially in the lower part, a, a, of the figure. Magnitude as seenunder a power of 200, but not drawn to a scale (from a drawing by Allen Thomson). MINUTE STEUCTUEE OF BONE. 95 fibres have been pulled out (fig. 96, c). The processes in question arethus, so to speak, viewed in profile; but they may frequently also beseen on the flat surface of detached lameUte (fig. 94), projecting likenails driven perpendicularly. The perforating fibres are, like the decussating fibres, for the mostpart bundles of fibrils which agree in character with those of thewhite fibrous tissue; but some, as shown by H. Miiller, are of the natureof e
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
