Quain's elements of anatomy . c TOaN OYt FEOM A DECALCIFIED HTJAfArr PAErETAI BOyE AT SOHEDEPTH FEOM THE StTEFACE (Sharpey). a, lamellse, showing decussating fibres : 6, 6, thicker part, where seTeral lameUie aresuperposed ; c, c, perforating fibres. Apertures through which perforating fibres had•passed, 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 AUen Thomson). MIXUTE STEUCTUEE OF BO]SrE. 95 Sbres hare been pulled ont (fig. 9G, c). The processes in question arethus, so to speak, xiewed in profi
Quain's elements of anatomy . c TOaN OYt FEOM A DECALCIFIED HTJAfArr PAErETAI BOyE AT SOHEDEPTH FEOM THE StTEFACE (Sharpey). a, lamellse, showing decussating fibres : 6, 6, thicker part, where seTeral lameUie aresuperposed ; c, c, perforating fibres. Apertures through which perforating fibres had•passed, 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 AUen Thomson). MIXUTE STEUCTUEE OF BO]SrE. 95 Sbres hare been pulled ont (fig. 9G, c). The processes in question arethus, so to speak, xiewed in profile; but rhej may frequently also beseen on the flat surface of detached lamellte (fig. 94), projecting hkenails driren perpendicularly. The perforating fiibres are, like the decussating , for the mostpart bundles of fibrils which agree in character with those of thewhite fibrous tissue; but some, as shown by H. Mtiller, are of the natureof elastic tissue (fig. 95, e). In some parts thev escape calcification, Fis. Kg. 95. TeA^TSTEKSE section of rECALCIFIED HnrAX TIBIA, FSOa XZAE THE STTRFACE OP THE SHAFT (E. A. S.). H, H, Haversiaii canals, witli their STstems of concentric lamellce; in all the rest ofthe figure the lanieUre are circumferentiaL s, ordinarr perforating fibres of Shaxpey; e, e, elastic perforating fibres. Drawn undera power of about 150 diameters. and thus, as they shriuk iu drying, leave tubes or channels in the drybone, generally leading from the surface inwardly: but these uncalcifiedfibres are by no means frequent. The perforating fibres are often con-nected with the periostemn, as is the case with most of those whichpenetrate the external table of the cranial bones ; but iu cross sectionsof cylindrical bones they often appear to spring with their broadends from the deeper lamellte (with the fibres of which they maybe directly contuiuous), and especially from those near the circumferenceof a Haversian system, and taper outwards into fine points,
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
