Bremer, Aberrant Roots. 



623 



the bundle arising by three ventral roots of its own, and joined by 

 a posterior branch of the abducens, running up beside the medulla 

 to end in the mesenchyma of the top of the head. Butthose fibers 

 which have a lateral course are shown best in a view of the under 

 surface of the medulla, fig. 5. On the right side of the drawing 



Fig. 3. Graphic reconstruction of human embryo 22.0 mm. (H. E. C. series 851, sections 250 to 

 320). X 14. The cartilaginous base of the skull is cut in the outer section, and shows the anterior 

 condyloid foramen, through which the hypoglossal roots pass; the jugular foramen is laid open to 

 show an aberrant ventral root, a, passing through with the glossopharyngeal ners'e. For other letter- 

 ing, see fig. I. 



(the left side of the embryo) the otocyst is shown lying close to 

 the rounded side of the medulla. Caudal to this is the glosso- 

 pharyngeal nerve, arising from the lateral zone of the medulla, 

 and cut ofi^ as it is running toward us. Behind this is the vagus, 

 also drawn as though cut off, and joined caudally by the accessory, 



