Direction of fusion of neural folds during formation of neural tube is:
Gradually, the neural folds approach each other in the midline, where they fuse. Fusion begins in the cervical region (fifth somite) and proceeds cranially and caudally. As a result, the neural tube is formed. Ref: Langman's embryology 11th edition Chapter 6.
Caudal
Cranial
Both of the above
None of the above