. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Epithelium of Synovia! Membranes. a, free surface seen iu situ; b, separated cells. {Magnified 200 diameters.) some of which are seen decussations of two convex outlines, caused by the margin of one cell slightly overlapping that of its neighbour. Acetic acid exerts an unusual effect upon the cell-membrane, swelling up its outline very much before dissolving or rupturing it; an appearance which obtains in the more flat- tened and polygonal epithelia of the serous membranes, but, so far as I have seen, in a much smaller d
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Epithelium of Synovia! Membranes. a, free surface seen iu situ; b, separated cells. {Magnified 200 diameters.) some of which are seen decussations of two convex outlines, caused by the margin of one cell slightly overlapping that of its neighbour. Acetic acid exerts an unusual effect upon the cell-membrane, swelling up its outline very much before dissolving or rupturing it; an appearance which obtains in the more flat- tened and polygonal epithelia of the serous membranes, but, so far as I have seen, in a much smaller degree. Like those of the bursse, they are firmly attached to the .sub- jacent tissue, and possess little mutual ad- hesion ; though here and there a cluster of two or three more polygonal than usual may be found. Cytoblasts are rare, the cells ap- pearing to be completed by the addition of the outer membrane when yet extremely small, (fig. 399. b.) All these peculiarities might perhaps be generalized in the statement, that the cells which cover the general surface of these membranes are in a younger and more active stage of cell-life than those of the bursae. And a slight yet perceptible difference in the same respect has been already indicated as existing between the subcutaneous and sub- tendinous members of this class of structures. Immediately beneath these cells lies a stratum of looser arcolctr tissue, which connects the membrane with the inner aspect of the liga- ments of the joint. It includes little of the yellow fibrous tissue, and its meshes are comparatively few and close : exteriorly, they unite, by a gradation of structure, with the dense white fibrous tissue of which the liga- ments are composed. The vessels of the membrane are exceedingly numerous, and its capillaries form a horizontal plexus, which ramifies immediately beneath the epithelium in the areolar tissue just men- tioned. The great vascularity of the tissue has long been known, but the capillaries are
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