Abstract
AbstractSerial sections of the brains of four adult male hyraxes revealed a hitherto undescribed ependymal organ near the middle of the midbrain aqueduct. This structural modification of the dorsal wall of the aqueduct is separate and different from both the subcommissural organ and the posterior collicular recess. It is characterized by: (1) an elaborate system of ridges and crypts, (2) numerous, crowded and distinctive ependymocytes, (3) tissue zonation, and (4) numerous vessels with sleeves of primarily longitudinally arranged glial processes. Comparisons with other ventricular organs and possible functional relations are discussed.
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