244 ALBERT KUNTZ 



These are obviously the "indifferent" cells of Schaper. Among 

 these, other cells occasionally are found which are characterized 

 by large rounded or elongated nuclei showing a well defined nucle- 

 olus and very little chromatin structure, and a larger cytoplasmic 

 body which is usually drawn out to a point at one side (fig. 17). 

 These cells are obviously the " neuroblasts" of Schaper. From 

 this description it is obvious that the cells which migrate from 



Fig 16. Diagram designed to show the relation of the vagi to the vagal sympa- 

 thetic plexuses. The arrows indicate the course and the direction of the cells mi- 

 grating from the walls of the hind-brain and the vagus ganglia into the anlagen 

 of the vagal sympathetic plexuses. 



a. a., Aortic arch, aw., Auricle, b. c, Buccal cavity, br., Bronchi, ear. p., Anlagen 

 of cardiac plexus, cb.l., Cerebellum. /.&., Fore-brain, g.t., Ganglion of the trunk. 

 m. b., Mid-brain, m.ob., Medulla oblongata, n A., Neural tube, oe., (Esophagus. 

 oe.p., (Esophageal plexus, p. a.. Pulmonary artery. St., Stomach, t., Trachea. 

 ven., Ventricle, ven. IV., Fourth ventricle, v.t., Vagus trunk. 10., Roots of vagus 

 nerve. 11., Roots of spinal accessory nerve. 12., Roots of hypoglossal nerve. 

 r.J., First cervical nerve. 



the vagus ganglia and the walls of the hind-brain along the vagi 

 are cells of the same character as those which migrate from the 

 neural tube and the spinal ganglia along the spinal nerves. 



The above observations prove conclusively that the myenteric 

 and the submucous plexuses, the pulmonary plexuses, and the 



