156 THE POCKET ANATOMY 



and jugular fossa. It passes through the temporal bone com- 

 municating with the facial, and emerges by the auricular 

 fissure just behind the external auditory meatus. Finally it 

 divides into two branches, to supply the back of the pinna, 

 which inosculate with the posterior auricular of the facial. 



Pharyngeal : principally formed by fibres from the accessory 

 of spinal accessory, passes superficial to internal carotid artery 

 to upper part of middle constrictor, where it joins branches 

 from glosso-pharyngeal, superior laryngeal, and sympathetic 

 to form the pharyngeal plexus. 



Superior laryngeal : from the ganglion of the trunk, passes 

 down behind internal carotid artery, where it divides into 

 external laryngeal nerve, which communicates with pharyngeal 

 plexus and upper cardiac of sympathetic, supplies the crico- 

 thyroid and inferior constrictor muscle and internal laryngeal 

 nerve, which passing through thyro-hyoid membrane, is dis- 

 tributed to the mucous membrane of the larynx, and com- 

 municates with a branch from the recurrent laryngeal. 



Inferior or recurrent laryngeal : the right nerve arises in 

 front of subclavian artery, winds back round it, and passes up 

 behind common carotid and inferior thyroid arteries to right 

 side of trachea. The left nerve arises on front of arch of 

 aorta, round which it winds to the left of the ductus arteriosus 

 and passes up by left side of trachea. Both nerves ascend in a 

 groove between trachea and oesophagus, and enter larynx by 

 passing under lower border of inferior constrictor muscle. 

 The nerve supplies all the muscles of the larynx (except the 

 crico- thyroid), the inferior constrictor, communicates with 

 the internal branch of the superior laryngeal, and gives 

 branches to the cardiac plexus, inferior cervical ganglion of 

 the sympathetic, to the trachea, and to the oesophagus. 



Cervical cardiac (2 or 3) : Superior are small ; join cardiac 

 of sympathetic. Inferior, one on either side, arise just above 

 ist rib ; the right one passes by the side of innominate 

 artery and joins deep cardiac plexus ; the left one descends 

 in front of the arch of the aorta, and joins superficial cardiac 

 plexus. 



Thoracic cardiac : right ones from the trunk of the nerve, 

 end in deep cardiac plexus. Left ones arise from left recurrent 

 laryngeal. 



Anterior pulmonary (2 or 3) : to anterior part of root of 

 lung, joining with sympathetic to form the anterior pulmonary 

 plexus. 



Posterior pulmonary : numerous, to posterior part of root 

 oi lung, which join branches from 2nd, 3rd, and 4th thoracic 



