👉 Trematoid, also known as a hyaline cell, is a type of cell that is found in the brain and spinal cord. It is characterized by its distinctive appearance and function, which include being involved in the production of cerebrospinal fluid (CSF), which contains substances like protein, glucose, and hormones. Trematoids are part of the cerebral cortex, where they play an important role in regulating blood flow to the brain. They also have a role in the