What is the process of formation of the ventricles prosencephalon mesencephalon rhombencephalon?
Around the end of the first gestational month, a series of bulges anterior to the first cervical somites appears. The first bulge is the prosencephalon, or forebrain.
The cavity of this bulge forms the lateral ventricles and third ventricle. Secondary outpouchings from the forebrain are called optic vesicles and eventually form the retina, pigment epithelium, and optic nerve.
The second bulge is the mesencephalon, or midbrain.
The cavity of this bulge forms the cerebral aqueduct.
The third bulge is the rhombencephalon, or hindbrain. This cavity gives rise to the fourth ventricle.
