110 AYES. 



PLATE XXIV, 



THE THORACIC PORTION OF THE SYMPATHETIC 

 NERYE IN THE LEFT SIDE OF THE SWAN. 



(CYGNUS OLOR.) 



FIG. I. 



1. SYMPATHETIC nerve: at the very bottom of the neck it emerges from the 



vertebral canal, and is continued through the thorax, and near its entrance 

 into this begins to form a double communication with the spinal nerves, one 

 branch passing* over the other underneath the head of each rib. The ganglia 

 are connected with the ganglia of the six dorsal nerves after the first, but 

 with the cervical and lumbar nerves, and not the .ganglia. On separating 

 the anterior and posterior bundles of one of the largest spinal nerves, the 

 sympathetic appeared to communicate quite as much with one as the other. 



2. Branches from the first thoracic ganglion to communicate with the pulmonary 



branches of the par vagum, and accompany the large bloodvessels to the 

 heart. 



3. First large splanchnic nerve ; it is given off by the thoracic portion of the 



sympathetic, and after communicating with that of the right side on the 

 coeliac artery, the branches proceed from the union along the branches of 



