Quain's elements of anatomy . are to be looked upon as corresponding to thecell-spaces of that tissue. Apertures and decussating fibres of the lamellee.—With a littlepains, thin films may be peeled off in a longitudinal direction fiom ajDiece of bone that has been softened in acid. These for the most partconsist of several lameUje, as may be seen at the edge, where the differentlayers are usually torn unequally, and some extend farther than in this way, under the microscope, the lameU^e are seen to beperforated with fine apertures placed at very short distances apart. Theseaper
Quain's elements of anatomy . are to be looked upon as corresponding to thecell-spaces of that tissue. Apertures and decussating fibres of the lamellee.—With a littlepains, thin films may be peeled off in a longitudinal direction fiom ajDiece of bone that has been softened in acid. These for the most partconsist of several lameUje, as may be seen at the edge, where the differentlayers are usually torn unequally, and some extend farther than in this way, under the microscope, the lameU^e are seen to beperforated with fine apertures placed at very short distances apart. Theseapertures were described by Deutsch ;* they appear to be the transversesections of the canaliculi already described, and their relative distanceand position accord sufficiently with this explanation. According to thisview, therefore, the canaliculi might (in a certain sense) be conceived toresult from the apposition of a series of perforated plates, the -apertures * De Peuitiori Ossium Structure. ^Vratisl. 1S34, p. 17, Fig. MIXUTE STRFCTUEE OF BOXE. 93 of each plate corresponcling- to those of the plates contig-iious with it ; orthey might be compared to holes bored to some depth in a straightor crooked direction through the leaves of a book, in which case it isplain that the perforations of the adjoining leaves would correspond ; itbeing understood^ however, that the passages thus formed are most likelybounded by proper parietes. The apertures now referred to must be dis-tinguished from larger holes seen in some lamellae, which give passage tothe perforating fibres to be mentioned farther on. But the lamellte have a further structure. To see this, the thinnestpart of a detached shred or film must be examined, as shown in figs. 92and 94 ; it will then appear plainly that they are largely made up oftransparent fibres, decussating with each other in the form of anexceedingly fine network. In the Haversian systems these decussatingfibres cross one another in different lamellae a
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
