Anatomy:

• Ciliated cuboidal or columnar epithelial cells lining ventricles and central canal.

• Apical cilia move cerebrospinal fluid (CSF); microvilli absorb nutrients.

• Form a single-layered epithelium, part of the ependyma.

Function:

• Produce and circulate CSF (in choroid plexus).

• Create a barrier between CSF and brain parenchyma.

• Facilitate exchange of signaling molecules between CSF and brain tissue.

• Serve as neural stem cells in certain regions (e.g., subventricular zone).