. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. by the cells. a, intercellular tissue • . . ossified ; b, ossified pari- parietes of the corpus- etes of the corpuscles ; c, granular lobules con- tained in the tubes. cle is at first thin, and, could it be withdrawn entire, would look like a tube formed by the junction of a number of hollow beads. Partial separation may, however, be produced, as seen in fig. 463. This state of alternate dilatation and contraction seen in the tube at its first formation is soon lost, and the tube becomes of nearly equal diameter through-
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. by the cells. a, intercellular tissue • . . ossified ; b, ossified pari- parietes of the corpus- etes of the corpuscles ; c, granular lobules con- tained in the tubes. cle is at first thin, and, could it be withdrawn entire, would look like a tube formed by the junction of a number of hollow beads. Partial separation may, however, be produced, as seen in fig. 463. This state of alternate dilatation and contraction seen in the tube at its first formation is soon lost, and the tube becomes of nearly equal diameter through- out from the filling up of the dilatations by the deposition of osseous matter in the usual gra- nular form. But in this filling up of the dila- tations small cells are left, and these are the bone-cells in the rudimentary condition, and form the outer layer of cells in the Haversian system. (See fig. 463.) At first it is difficult p. .fl~ to distinguish the tubes of the bone-cells, but if a section be taken nearthe perfectedbone, they svill be seen in va- rious stages of deve- lopement. At this late period of the formation, bone-cells appear in the ossified intercellu- lar tissue, which from the first formed a con- nection between the systems of tubes, and which iu fully formed Section showing the develope- b°™ unltes the Haver- men* of the bone cells and sian systems. W ith this the separation that may\\Q have bone in its be produced between the perfect State. c ., From na» site and the tissue of the . ... , united cells. stated it will be seen a, ossified intercolumnar that the cartilage cell or tissue; b, ossified parietes corpuscle is the first of the united cells; c, the part formed; that this Haversian canal in its ru- n generates others . dimentary state ; a, bone . ,, , cells in their first stage ofthat they form the developement. linii g of the primary tube; that the lining becomes the external lamina of an Haversian system : so that the parietes of the
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