J.Jpn. Surg. Soc.. 58(4): 610-618, 1957
STUDIES ON THE PERIVASCULAR SPACE
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Department of Surgery I., Hiroshima University Medical School (Director: Prof. R. Uemura) Takeo YAMAMOTO |
1. The perivascular space exists between a layer of the pia mater, external wall, parenchymatous side, and a layer of the arachnoid, internal wall, perivasucular side. The perivascular space between the pia mater and the arachnoid extends from the subarachnoid space along the perivascular on to the first region of the encephalovessel branch pattern after Allexander and Putnam.
In the pericapillary, the perivascular space is externally bounded by a kind of glial membrane and internally by capillary membrane. Anatomically the perivascular space has no communication with the pericapillary.
2. In lower vertebras, the development of intracerebrospinal fluid system is ovserbed, while in higher vertebras that of extracerebrospinal fluid system is mote remarkably recognized. Extracerebrospinal fluid spreads into the cerebral parenchyma through the perivascular space.
3. The formation of the perivascular space is not recognized around vessels newly developed with remarkably regressive changes in the site of injury of the cerebral parenchyma.
At the junction of the normal part with the site of remarkably regressive changes is found the perivascular space, which shows deformation or enlargement and develops circulatory disturbance of the cerebrospinal fluid.
4. It may be concluded that the protection of the cerebral parenchyma from static external force is subjected to the buffer action of the perivascular space.
(author's abstract)
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