Template:Ref-O'Rahilly1981
From Embryology
O'Rahilly, R., and Muller, F. 1981. The first appearance of the human nervous system at stage 8. Anat. Embryol, 163, 1-13.
O'Rahilly, R., and Muller, F. 1981. The first appearance of the human nervous system at stage 8. Anat. Embryol, 163, 1-13.