Ependymal Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Ependymal and links to relevant pages within the course.
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| Which of the following cells are considered abnormal on a CSF differential? | View Page |
| Location of CSF Most cerebrospinal fluid originates in the choroid plexus. The choroid plexus is composed of a mass of tiny blood vessels which are located in the third lateral and fourth ventricles.
The remaining CSF, about 30%, is formed in other sites such as the subarachnoid space and the ependymal lining of the ventricles.
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| Pia Arachnoid Mesothelial Cells Pia arachnoid mesothelial (PAM) cells are often found in spinal fluid because they line the arachnoid space between the skull and the cerebrum. Ependymal cells which line the ventricles may also be present. Since ependymal and mesothelial cells are normal findings, the term mesothelial is sometimes used as a general term for both. It is essential to differentiate these tissue cells from blast cells or tumor cells which have diagnostic significance. An example of a pia arachnoid mesothelial cell, as indicated by the arrow, is present in this slide. Differentiating characteristics of this type of cell include an off-center, single, round nucleus and irregular cytoplasm that exhibits pseudopods.
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