. On the anatomy of vertebrates [electronic resource] . e accompanying the 4 internal mammary vessels toform three or four trunks communicating with the thoracic direct work of taking up waste tissues is done by indepen-dent organites : the earliest recognitionof absorbents is as intercellular spacesor areolae (vol. i. p. 455), or serous cavi-a ties; the canals continued from which,when filled by injected fluid, resemblea plexus, such as Breschet has deli-- neated in figure 393: such plexiformbeginnings are commonly superficial,as beneath the skin and the serous sur-face of organs: in
. On the anatomy of vertebrates [electronic resource] . e accompanying the 4 internal mammary vessels toform three or four trunks communicating with the thoracic direct work of taking up waste tissues is done by indepen-dent organites : the earliest recognitionof absorbents is as intercellular spacesor areolae (vol. i. p. 455), or serous cavi-a ties; the canals continued from which,when filled by injected fluid, resemblea plexus, such as Breschet has deli-- neated in figure 393: such plexiformbeginnings are commonly superficial,as beneath the skin and the serous sur-face of organs: in the substance of or-gans and tissues the origins arelacunar: Initial plexus of Lymphatics, clxviii. , , n , n n , m both torms the tree surface showsnucleate scale-cells. When a distinct wall can be defined, thelymphatics of Mammals are seen to be more numerous, mi-nute, and highly finished than in lower Vertebrates. And,though remarkable for their almost transparent delicacy, theirwalls are strong, and in them may be distinguished fibrous layers 393. ABSORBENT SYSTEM OF MAMMALIA. 507 and a lining membrane : the latter consists of flat and nucleateepithelial cells, adherent to a reticulate subfibrous membraniformbasis: it presents a smooth surface, like that of a serous membrane,to the naked eye. The fibres of the middle tunic affect a circulararrangement, are contractile like other fibres of the 6 smoothsystem, and are also elastic. An outer tunic may be defined by 394 395
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