J.Jpn. Surg. Soc.. 57(12): 2022-2029, 1957

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STUDIES ON THE PERIVASCULAR SPACE (REPORT III.) COMPARATIVE ANATOMICAL STUDIES ON THE PERIVASCULAR SPACE

Here the author summarizes the results of studies on the perivascular space, which were carried out by the application of the brain and spinal cord of Vertebrata such as Macaca cyclopis, Columba livida domestica, Clemmys japonica, Bufo japonica, Cyprinus auratus and man.
1. In the perivascular space of each Vertebrata except fishes, the meninx (the meninx secondaria in amphibia reptiles and birds, the arachinoid and pia mater in man and mammals) forms the covering of the brain. The interval between the inner and outer layers of the meninx secondaria or between the arachinoid and pia mater is in a broad sense the subarachinoid space. They enter the parenchyma of the brain, and thus around vessels forms the space: the wall and inner structure of which are similiar to the situation relating to the surface of the brain. This cavity consists of the network of lattice fibers as the subarachinoid space in a broad sense.
2. In the lower Vertebrata the perivascular space serves an important channel in which ventriclar liquor is contained.
3. In fishes alone no perivascular space is recognized, but the parenchyma of the brain is moistend with ventriclar liquor ; the form of the brain is specific.
(author's abstract)

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