228 



ELEMENTS OF MAMMALIAN ANATOMY. 



a branch goes to the vagus nerve, several branches 



to the brachial plexus, and 

 a branch to the heart, form- 

 ing the cardiac plexus, while 

 the main sympathetic cord 

 continues along the dorsal 

 thoracic wall. A ganglion 

 occurs opposite each verte- 

 bral body, from which it 

 gives off a branch to the 

 corresponding spinal nerve. 

 The great splanchnic arises 

 from the main cord just 

 cephalad of the diaphragm 

 and extends to a group of 

 ganglia in the region of the 

 trunk of the coeliac axis 



FIG. 103. CHIEF PART OP LEFT 

 HALF OF SYMPATHETIC SYSTEM 

 CEPHALAD OF THE DIAPHRAGM. 

 Semidiagrammatic. 



5, 6, 7, 8, 9, and 10, Fifth, sixth, 

 seventh, and eighth cervical 

 nerves, and first and second 

 thoracic spinal nerves; a, the 

 dorsal branch of the left vagus 

 In; an, dorsal branch of the right 

 vagus ; ax, common dorsal vagus 

 formed by a and an; avb, ventral 

 vagus ; be, cardiac branch of sg, cr, 

 carotid plexus; car, carotid ar- 

 tery ; cm, rami communicantes ; cp, 

 cardiac plexus; dia, diaphragm; 

 g, ganglia in the thoracic cavity ; 

 ig, middle cervical ganglion; Ig, 

 portion of left lung ; In, left vagus 

 nerve; nv, cranial nerve; pn, 

 phrenic nerve; pp, pulmonary 



I plexus ; sn, sympathetic cord ; sm, 



superior cervical ganglion ; sb, left 

 subclavian artery; sg, stellate ganglion or inferior cervical; spm, splanch- 

 nic major nerve ; vg, vagus ganglion ; v, vagus nerve. 



