60 AMPHIBIA. 



hyoid bone, and the side of the pharynx, and then terminates on the 

 membrane of the fauces covering the pharynx and tongue. 



G. Anterior trunk of the ninth nerve ; it gives branches to the genio-hyoideal 

 muscle, the genio-glossal, and the hyo-glossal. 



7. A nerve from the ninth, giving branches to a long muscle analogous to the 



sterno-mastoid, and then sending a branch to join one from the first and 

 and second cervical nerves, and terminate on the sterno-thyroideal muscle, 

 one attached to the posterior surface of the oesophagus, and one at the side 

 of the neck. 



8. Sympathetic nerve passing to the first thoracic ganglion ; it sends up branches 



to communicate with the cervical nerves ; those at the upper part of the 

 neck are delicate and traced with difficulty, they do not enter a canal with a 

 vertebral artery, as in mammalia and birds, but pass on the outside of the 

 spine ; it communicates with the nerves about to form the axillary plexus, 

 also with the trunk of the par vagum, and sends many filaments on the 

 arteries. The prolongation from it through the thorax communicates or 

 coalesces with the ganglia of the dorsal nerves, but the anterior branch of 

 each intercostal artery passes through or is embraced by this union. The 

 prolongation frequently consists of a thick branch and a very fine one, and 

 passes down to each succeeding ganglion, but neither of them passes behind 

 the neck of each rib, as in birds. It gives many small branches to the 

 connecting membrane of the viscera, but the principal branches of each side 

 form two intricate plexuses, which are in the place of the semilunar ganglia ; 

 the superior or smaller portion follows the branches of the coeliac artery to 

 the stomach, the lower or larger, the branches of the mesenteric artery to the 

 intestines. Other branches pass from the sympathetic to the kidney, and 

 the spinal nerves keep sending filaments towards this part, which seems to 

 be the situation of the prolongation, and it is continued down to the side of 

 the rectum, communicating with all the spinal nerves until their extreme 

 minuteness prevents their further continuation from being easily followed. 



9. First cervical nerve. Some of the cervical nerves are seen passing to the 



muscles and skin of the neck ; those of the axillary plexus to the muscles 



