Abstract
Detailed fine structure of elastic fibers and their distribution in the brains of rats, guinea pigs, and cats were examined by conventional and high-voltage (HVEM) electron microscopes. Small elastic fibers were observed in the perivascular space of fenestrated capillaries in circumventricular organs such as the area postrema, the subfornical organ, and the pineal body. The amorphous component of elastic fibers was identified as elastin by its affinity for orcein and specific susceptibility to elastase. Stereoscopic observation by HVEM revealed the right-turned double-stranded helical structure of microfibrils of elastic fibers. Some physiological roles of these elastic fibers are discussed as related to a possible cerebrospinal fluid absorptive system in the central nervous system.
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