Imaging spectrum of spinal dysraphism on magnetic resonance: A pictorial review

Figure 3 Secondary neurulation. Schematic diagram of caudal end of embryo showing secondary neurulation which forms the distal part of spinal cord. There is formation of solid caudal cell mass distal to the caudal neuropore which then develops a lumen by a process called “cavitation”. This then becomes continuous with the central cavity of neural tube.