Kan suksa subtrochlear organ khong kai.
1987
Uryu Kunihiro | Hirunagi Kanjun | Fujioka Toshitake
Subtrochlear organ (STO) in the domestic fowl had a form of a "V" in the ventricular wall of the posterior mesencephalon. Its apex was at the median sulcus, while the arms of the V were directed rostrolaterally. The SEM revealed three types of ependymal cells in this specialized area; 1) ciliated cell with a tuft of cilia 2) single cilium-bearing cell, and 3) cell having a bulb-shaped protrusion into the ventricle. Ependymal cells of type 2 were predominantly seen in the lateral zone of the STO, and here the type 1 cells were usually grouped into several small islands. Bulb-shaped protrusions were restricted to the median zone of the STO. These protrusions had relatively smooth surfaces that were devoid of microvilli. The protrusions varied in diameter from 0.8 um. to 2.0 um. In area adjacent to the STO, the ventricular surface was generally lined with cell bearing the tuft of cilia. Supraependymal cells were often seen on the STO. The three types of the ependymal cells were also comfirmed with TEM. The ependymal cells of the STO usually had a long extended basal process characteristic of a tanycyte, a specialized ependymal cell. However, these cells could be distinguished from each other, because they showed ultrastructural differences in the apical cytoplasm of the cell and lateral plasma membrane. The significant differences are summerized as follows. 1) The first type of ependymal cell has several basal bodies of cilia and ciliary rootlets. 2) In the second type of cell, the cilia structure is rarely seen. 3) The third type of cell has a ventricular cytoplasmic protrusion containing numerous free ribosomes. The lateral cytoplasmic membranes of the type 1 and 3 are complex and interdigitated, whereas those of type 2 appear straight.
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