88 Development of Occipital Nerves in Human Embryos 



At this time the fibres of the ventral roots of the spinal nerves are gath- 

 ered into loose bundles and can be traced a short distance in the 



X-Xigang. crest. 



bridge. 



Fig. 1. Reconstruction of peripheral nerves in three weeks human embryo, 4.0 mm. long, 

 Hertwig collection No. 137. Enlarged 16.7 diams. 



gang, crest. 

 XI fibres. 



Gang petros. 



Fig. 2. Reconstruction of peripheral nerves in three weeks human emhryo, 4.3 mm. long. 

 Mall collection No. 148. Enlarged 16.7 diams. 



X x/ gang, crest. 



XI f'bres 



< peiroSs 

 Gang, nodos. 



Fig. 3. Reconstruction of right side of same embryo shown in fig. 2. 



mesoderm. Among them are many of the so-called sheath cell nuclei. 

 Owing to the fact that the fibres of the ventral roots run through the 



