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The rhombencephalic recess in the rat. A light and electron microscopic study
Abstract:
The rhombencephalic recess, an ependymal organ, has been studied for the first time by light- and electron microscopy. It is situated mediosagitally on the floor of the rhomboid fossa at the level of the colliculus facialis. The recess and the superimposed tissue are built up by tanycytes, their apices being connected by tight junctions. HRP, injected into the c.s.f., does not penetrate into the intercellular clefts of the recess area. The recess area reveals a certain autonomy regarding its supply with arteries and capillaries. A blood-brain barrier exists, but shows slight leakage in circumscribed areas as a result of intense transendothelial vesicular transport. The organization of the recess area is compared with that of other ependymal organs, especially circumventricular organs.
Insights
The rhombencephalic recess, a unique brain organ, was studied using microscopy. This ependymal organ, composed of tanycytes, shows a blood-brain barrier with some leakage, suggesting specialized function.
Area of Science:
- Neuroscience
- Cell Biology
- Histology
Background:
- The rhombencephalic recess is an ependymal organ located in the rhomboid fossa.
- Its structure and function have not been previously studied in detail.
Purpose of the Study:
- To investigate the ultrastructure of the rhombencephalic recess using light and electron microscopy.
- To characterize the blood-brain barrier properties and vascular supply of this brain region.
Main Methods:
- Light and electron microscopy were employed to examine the rhombencephalic recess.
- Horseradish peroxidase (HRP) was used to assess the permeability of the blood-brain barrier.
- Vascular supply was analyzed through examination of arteries and capillaries.
Main Results:
- The rhombencephalic recess is composed of tanycytes with apically connected tight junctions.
- HRP did not penetrate intercellular clefts, indicating barrier integrity.
- The recess exhibits vascular autonomy with a blood-brain barrier showing localized leakage via vesicular transport.
Conclusions:
- The rhombencephalic recess possesses a distinct structure and blood-brain barrier characteristics.
- Its organization suggests specialized functions potentially differing from other ependymal organs.
- Further comparison with circumventricular organs is warranted.