Cranial Nerves. 



141 



N. LARYNG-.__ 

 RECURR. VAGI 



485. The Superior and Recurrent Laryngeal Nerves. 



b) Branches of the eleventh and twelfth cranial nerves send motor fibres 

 to the vagus in the Plexus nodosus, which soon after leave as pharyngeal 

 and laryngeal branches, Rami pliaryngei and laryngei. 



c) From the Plexus nodosus branches of communication pass to the 

 superior cervical ganglion of the sympathetic and to the plexus of the 

 superior cervical nerves; further the 



d) Superior and inferior pharyngeal nerve, Nervus pharyngeus 

 superior et inferior, whose branches form, in connection with those of the glosso- 

 pharyngeal and sympathetic nerves, the Plexus pliaryngeus. 



e) Superior laryngeal nerve, N. laryngeus superior, passes along 

 the inner side of the internal carotid artery to the larynx and divides into an 

 external and internal branch, R. externus and internus; the former ends in 

 the inferior constrictor and crico-thyroid muscles; the latter pierces, together 

 with the laryngeal artery, the thyro-hyoid membrane, and supplies the posterior 

 surface of the epiglottis and mucous membrane of the larynx down to the glottis. 

 The internal ramus always inosculates with the recurrent laryngeal nerve of 

 the vagus. 



f) Filaments of communication to the descending ramus of the hypoglossal 

 and the internal carotid plexus. 



g) Two to six cardiac branches to the cardiac plexus. 



19* 



