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A mid‐aqueductal ependymal organ in the brain of the hyrax ( Procavia capensis )
Author(s) -
Quay W. B.
Publication year - 1971
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.901420209
Subject(s) - subcommissural organ , biology , anatomy , ependyma , ependymal cell , cerebral aqueduct , midbrain , dorsum , spinal cord , neuroscience , central nervous system , cerebrospinal fluid
Serial 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.