Summary
The ontogenetical development of the subcommissural organ (SCO) was investigated in chick embryos collected daily from the 1st to the 21st day of incubation. Some duck embryos, and adult chickens and ducks were also studied. Immunocytochemistry using an anti-Reissner's fiber (RF) serum as the primary antibody was the principal method used.
In the chick embryos the events occurring at different days of incubation were: day 3 morphologically undifferentiated cells in the dorsal diencephalon displayed immunoreactive material (IRM); days 4 to 6 immunoreactive cells proliferated, formed a multilayered structure and developed processes which traversed the growing posterior commissure and ended at the brain surface; day 7 i) blood vessels penetrated the SCO, ii) scarce hypendymal cells appeared, iii) the first signs of ventricular release of IRM were noticed, iv) appearance of IRM bound to cells of the floor of the Sylvius aqueduct; day 7 to 10 the number of apical granules and amount of extracellular IRM increased progressively; day 11 RF was observed along the Sylvian aqueduct; day 12 RF was present in the lumbar spinal cord; day 13 IRM on the aqueductal floor disappeared; days 10 to 21 i) hypendymal cells proliferated, developed processes and migrated dorsally, ii) ependymal processes elongated and their endings covered the external limiting membrane. In adult specimens the ependymal cells lacked basal processes and the external membrane was contacted by hypendymal cells. The duck SCO appears to follow a similar pattern of development.
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Supported by Grant I/60 935 from the Stiftung Volkswagenwerk, Federal Republic of Germany, and Grant RS-82-18 from the Dirección de Investigaciones, Universidad Austral de Chile. M.H. was recipient of a personal grant from JNO (29-5-54), which is gratefully acknowledged
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Schoebitz, K., Garrido, O., Heinrichs, M. et al. Ontogenetical development of the chick and duck subcommissural organ. Histochemistry 84, 31–40 (1986). https://doi.org/10.1007/BF00493417
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DOI: https://doi.org/10.1007/BF00493417