SYMPATHETIC SYSTEM IN MAMMALS 



221 



Fig. 1. Section showing the path of the com- 

 municating ramus in an embryo 9 in mm. length, 

 X 210. (See reference letters below.) 



REFERENCE LETTERS OF FIGURES 



(Except Fig. 16) 



All of the figures were drawn with the aid of the camera lucida or the projection 

 lantern. A uniform scale of magnification was not adopted, but the scale of 

 diameters of the drawing as reproduced is given in the description of each figure. 



a. i.e. -Accompanying indifferent cells. 



ao. -Aorta. 



b. rec. -Branch of recurrent nerve. 



ca.-Carotid artery. 



car.n.-Cardiac nerves. 



car. b. -Anlagen of cardiac plexus. 



c.r. -Communicating ramus. 



cm. d.n.r. -Cells migrating into dorsal 

 nerve-root. 



c.m.pv. -Cells migrating from sympa- 

 thetic trunks into prevertebral plex- 

 uses. 



c.m.v.r. -Cells migrating into ventral 

 nerve-root . 



c.m.vag.r. -Cells migrating into vagus 

 rootlets. 



(/.//./•.-Dorsal nerve-root. 



e.l.m. -External limiting membrane. 



f.pv. -Fibers extending into preverte- 

 bral plexuses. 



g.c. -Germinal cells of His. 



■i.c.c.r. -Indifferent cells in communica- 

 ting ramus. 



i.l.m. -Internal limiting membrane. 

 mes.-Mesentery. 

 m.r ./.-Motor root-fibers. 

 w.s.p.-Anlage of myenteric and sub- 

 mucous plexuses, 

 nb. -Neuroblasts. 

 oe. -(Esophagus. 



o. rec. n. -Origin of recurrent nerve. 

 /). <7. -Pulmonary artery. 

 pv. a. -Anlagen of prevertebral plexuses. 

 rec. n. -Recurrent nerve. 

 sp.g. -Spinal ganglion. 

 sp.7i. -Spinal nerve. 

 s.r./.-Sensory root-fibers. 

 supr. -Suprarenal bodies. 

 sy. -Anlagen of sympathetic trunks. 

 /.-Trachea, 

 ■fag. -Vagus trunk.*. 

 vag. b. -Branch of vagus nerve. 

 vag. r. -Rootlets of vagus nerve. 

 v.n.r. -Ventral nerve-root. 



