During embryogenesis in the choroid plexus of the ventricles, choroid plexus cysts can form. The choroid plexus consists of many capillaries, separated from the ventricles by choroid epithelial cells. The choroid plexus consists of modified ependymal cells. During prenatal development, some fetuses may form choroid plexus cysts. Cerebral organoids are most similar to layers of neurons called the cortex and choroid plexus. I lesion found in the choroid plexus. They may be created by epithelial cells of the choroid plexus. The tumor is neuroectodermal in origin and similar in structure to a normal choroid plexus. CSF is produced by the choroid plexus in two steps. There are three graded types of choroid plexus tumor that mainly affect young children. Bruch's membrane is the innermost layer of the choroid. The choroid is very thick and contains a fibrous "tapetum lucidum". In humans and most other primates, melanin occurs throughout the choroid. The appearance of punctate (punched out) areas is at the level of the inner choroid. Choroid plexus cysts (CPCs) are cysts that occur within choroid plexus of the brain.