Abstract: Choroid plexus found in brain ventricles makes up the blood brain barrier, secrets Cerebrospinal Fluid (CSF) and also preserves the homeostasis of CSF. With these functions, choroid plexus plays an important role in the growth and development of brain. Choroid plexus from the rat brain ventricles was investigated at ages from 14 days of gestation to 5 days after birth. On the 14th day of embryonic life, the structure of choroid plexus was observed. On the prenatal 18th day, it was found that the structure of choroid plexus was like the structure of choroid plexus seen after birth. The aim of our research is to assess different developmental characteristics choroid plexus with light microscope and to determine its histological structure.