The neural tube has not expanded as much as the cranial end. The spinal cord has obvious dorsal and ventral horns. Use the back button at the top of the Web Browser to return to this page. After the Last image is a Link to the Next Page. 4th ventricle- ventricular cavity within the rhombencephalon .
Space is continuous with ventricular system of the brain.
Connects centrally with the dorsal horn of the spinal cord. Generated from neuroepithelial stem cells in ventricular zone of neural tube. Form astrocytes, oligodendrocytes. In the brain it is the outer layer, in the spinal cord it is inner layer. Expression of different Hox genes along neural tube defines rostral-caudal axis and segmental levels.