



THE NERVES AND THEIR FUNCTIv 149 



in characters so clear that he that runs may read ! How 

 difficult, Bay, how impossible is it to hide or felsify tin ex* 

 ns which indicate the internal feelings! Thus con- 

 scious guilt shrinks from detection, innocence declares its 

 confidence, and hope anticipates with bright expectation." 



14.^The e*gk& pair of nerves consist of three distinct por- 

 the Jirst of which, from its being distributed to the 

 tongue and throat is called gbsm-pkaryngeal ; the tecomi, 

 from its irregular coarse is called ragout, or the wandering 

 nerve ; and die Ikird, from its origin from the spinal marrow, 

 is called accessory. These different nerves join just as they 

 are about to escape from the skull, which they do in com. 

 pany with the internal jugular vein, and as soon as they 

 emerge they form connections with the great sympathetic^ 



lo^Tlie twgowi on leaving the skull, sends off branches 

 to the pharynx and esophagus, also to the larynx and the 

 Mdij which close the air passage, and the mucous mem. 

 brane covering it Its trunk runs down the neck included in 

 the same sheath with the carotid artery and jugular vein, 

 and enters the chest under the collar bone) {Here a branch 

 is siven off, which locks round the subclavian artery on one 

 side, and arch of the aorta on the other, and goes up to the 

 larynx hence it is called recurrent. J It supplies those mus- 

 cles particularly which open the air passage. The vagans 

 sends down twigs with the sympathetic which surround the 

 the divisions of the wind-pipe, and accompany them in all 

 their ramifications through the lungs. It also sends numer- 

 ous t \vigs to the heart, stomach, liver, pancreas, spleen, in. 

 testinal tube, and finally with the sympathetic nerve, and forms 

 those great nervous centres or ganglia in the abdomen, which 

 supply all the viscera of that cavity with nervous energy) 



16. The phrenic nerve derives Its name from its distribu- 

 tion to the diaphragm, which at one time, was considered as 

 the seat of the soul. Jit passes out of the vertebral canal be- 

 tween the second, third, fourth, and sometimes fifth cervical 



