THE NERVOUS SYSTEM. 



497 



growth of the various branches of these nerves and their connection with the 

 differentiating structures innervated by them. At the same time there is an in- 

 creasing concentration of the cells, thereby forming more definite ganglionic 



Vesicula auditiva 



Gang, acusticum 

 Gang, semilunare n.V 



Gang. radicisn.IX 

 Gang, petrosum 



Gang, radicis n.X 



N. frontalis""" 



N. mandibularis 

 Gang, geniculatum --"' 

 N. chorda tympani .---' 



ang. Froriep 



N. hypoglossus 



ng. nodos. 



-N. desc. cerv. 

 "Rami hyoid. 

 (Ansa hypoglossi) 



~N. musculocutan. 

 N. axillaris 

 "N. phrenicus 

 -N. medianus 



X. radialis 



N. ulnaris 



ITh. 



Tubus digest.^' 



N. femoralis 

 N. obturatorius 



R. posterio 



R. terminalis lateralis 

 R. terminalis anterior 

 Mesonephros 

 Nn. ilioing. et hypogastr. 



FIG. 435. Lateral view of a reconstruction of a 10 mm. human embryo, showing the origin and 

 distribution of the peripheral nerves. The ganglionic masses are represented by darker and 

 the fiber bundles by lighter shading. For purposes of orientation the diaphragm and some 

 of the viscera are shown. The arm and leg are represented by transparent masses into the 

 substance of which the nerve branches may be followed. Streeter. 



