Arachnoid Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Arachnoid and links to relevant pages within the course.
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| Where does most cerebrospinal fluid originate? | View Page |
| The image is a stained smear of cerebrospinal fluid. Which of the following statements is true about the cells shown at the right? | View Page |
| Which of the following statements is true about the type of cell shown at the right? | View Page |
| 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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