MAMMALIA. 219 



18. Cord of the tympanum communicating with the hard portion of the seventh, and 



in the tympanum with the tympanine nerve of the glosso-pharyngeal and the 

 sympathetic, and passing forward to join the gustatory nerve. 



19. External auricular, or superficial temporal nerve, proceeding from the third 



trunk of the fifth ; it passes behind the ramus of the jaw ; it sends a large 

 branch forward to join the middle branch of the hard portion of the seventh ; 

 it sends a large branch backwards, one part of this passes to the inner 

 surface of the concha of the ear, the other communicates with a branch of the 

 hard portion of the seventh, passing to the muscles of the external ear, and 

 then terminates on the skin near the margin of the concha. 



20. Sixth nerve ; it communicates with the sympathetic, and a branch of the fifth 



passing to the lenticular ganglion ; it terminates in the abducent and 

 retractor muscles. 



21. Hard portion of the seventh. 



22. Glosso-pharyngeal nerve ; it sends filaments into the tympanum to communicate 



with branches from the sympathetic and the cord of the tympanum ; it gives 

 branches to communicate with branches of the sympathetic and the par vagum; 

 it gives branches to the muscles of the pharynx and the divisions of the caro- 

 tid artery, and then passes forwards, distributing branches to the tonsils, the 

 posterior part of the tongue and the membrane continued towards the larynx. 



23. Trunk of the par vagum; it communicates with the hard portion of the 



seventh, and, soon after it has emerged from the skull, with the accessory 

 nerve ; it gives off a branch to join others from the glosso-pharyngeal, to be 

 distributed on the pharynx; next it communicates with the first cervical 

 ganglion of the sympathetic ; it then gives off the superior laryngeal nerve to 

 the larynx, and passes down the neck. 



24. Accessory nerve ; it is joined by branches of the superior cervical nerves, and 



is then distributed on the sterno-mastoid and trapezius muscles. 



25. Ninth nerve ; it sends a filament to join the anterior trunk of the suboccipital, 



which gives branches to the sterno-hyoideal and sterno-thyroideal muscles, 

 and then divides into branches for the muscles connected with the hyoid bone 



and the tongue. 



F F 2 



