AVES. 113 



PLATE XXV. 



THE NEEVES OF THE SWAN. 





 (CYGNUS OLOE.) 



THE branches pointed out in the two preceding plates will not be particularly 

 noticed in this. 



1. First large splanchnic nerve. 



2. Second large splanchnic nerve: after this has been given off, the sympathetic 



passes downwards and communicates with the 'spinal nerves; it sends some 

 branches upwards to communicate with others from the splanchnic nerves, 

 and give branches to the kidneys and several to the meso-colon, many of 

 which advance forward and form an arch near to that of the meso-colic 

 artery, which at the superior part communicates with the splanchnic nerve, 

 and gives branches to the intestines and others to the delicate peritoneum. 



/ 



3. The sympathetic communicates freely with the anterior trunks of most of 



the spinal nerves within the pelvis ; these form several large cords, which 

 pass downwards to the muscles and other parts connected with the cloaca 

 and skin. 



4. Spinal cord ; it passes down of nearly the same size ; . about the middle of the 



neck it is rather smaller, and at the lower part begins to increase, and 

 becomes still larger about the middle of the portion giving off the nerves 

 to the axillary plexus ; it then gradually diminishes, and a great part of the 



Q 



