from The Century Dictionary.
- Of or pertaining to the ependyma of the brain; entocœlian, with reference to the lining membrane of the cavities of the brain: as, ependymal tissue. Also
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Of or pertaining to the
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A new study has found that transplantation of stem cells from the lining of the spinal cord, called ependymal stem cells, reverses paralysis associated with spinal cord injuries in laboratory tests.
The CNS is bathed in a special fluid the cerebral spinal fluid (CSF), which is produced by the ependymal cells.
The ependymal layer is ultimately converted into the ependyma of the central canal; the processes of its cells pass outward toward the periphery of the medulla spinalis.
Many believe that it is produced by the growing together of the walls of the posterior part of the central canal and by the development from its ependymal cells of a septum of fibrillated tissue which separates the future funiculi graciles.
Three layers may now be definedan internal or ependymal, an intermediate or mantle, and an external or marginal.
Later, by the growth and backward extension of the cerebellum, the roof is folded inward toward the cavity of the fourth ventricle; it assists in completing the dorsal wall of this cavity, and is also invaginated to form the ependymal covering of its choroid plexuses.
If a section across the wall of the hemisphere about the sixth week be examined microscopically it will be found to consist of a thin marginal or reticular layer, a thick ependymal layer, and a thin intervening mantle layer.
Neuroblasts from the ependymal and mantle layers migrate into the deep part of the marginal layer and form the cells of the cerebral cortex.
The ventral part of the mantle layer becomes thickened, and on cross-section appears as a triangular patch between the marginal and ependymal layers.
The germinal cells are large, round or oval, and first make their appearance between the ependymal cells on the sides of the central canal.