The ependyma and vascular pia mater – the tela choroidea, form regions of minute projections known as a choroid plexus that projects into each ventricle. The choroid plexus produces most of the cerebrospinal fluid of the central nervous system that circulates through the ventricles of the brain, the central canal of the spinal cord, and the subarachnoid space. The tela choroidea in the ventricles forms from different parts of the roof plate in the development of the embryo.
The ependyma and vascular pia mater – the tela choroidea – create regions of tiny projections called choroid plexus, which extend into each ventricle. The choroid plexus generates most of the cerebrospinal fluid in the central nervous system that flows through the brain’s ventricles, the spinal cord’s central canal, and the subarachnoid space. The tela choroidea within the ventricles develops from various parts of the roof plate during embryonic development.