. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. Les membranes synoviales et séreuses 512. Une telle conclusion. Observation montre que, dans le corps humain une variété de structures existent, qui sont unis par les caractéristiques non seulement d'une grande analogie d'office, mais aussi de la similitude de structure, l'identité presque complète de la composition chimique, et l'intimité des relations pathologiques. L'adoption de la possession de ces biens communs comme une base naturelle et sûre de la classification, on forme un groupe dans lequel sont inclus tous ces tissus qui servent à limiter, définir, ou fa

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 512 SEROUS AND SYNOVIAL MEMBRANES. such an inference. Observation shows that in the human body a variety of structures exist, which are united by the characteristics not only of considerable analogy of office, but also of similarity of structure, almost complete identity of chemical composition, and intimacy of pathological relations. Adopting the possession of these common properties as a natural and safe basis of classification, we form a group in which are included all those tissues which serve to limit, define, or facilitate movement. The class of structures thus constituted was formerly termed <; the Cellular System ; " but the cel- lularity which the name connotes, as it was never supposed to be predicable of all its members, so it is now known to be erro- neously used of that part of them to which it was originally applied ; and they have there- fore been preferably arranged under the head of " Passive Organs of Locomotion." And if any should consider this term open to the lesser objection of specifying a general, but not essential fact, that of " Passive Organs of Movement" might be again substituted. On this view we may regard serous mem- branes as forming one of a group of tissues. A further analysis of this group shows it to be composed of several members, separated from each other by differences, in which we may recognise a progressive, though some- what interrupted, series of gradations. These differences we shall now proceed rapidly to trace. Two important microscopical elements pervade all these structures, and will there- fore demand some attention. These are the ivhite and yellow fibrous tissues. The white fibrous tissue (fig. 395. a) consists of bands or bundles of a very variable width, which, unless artificially stretched, take a sinuous or wavy course ; and, at distant in- tervals, include cell-nuclei in their substance. They are marked with st

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