PARALYSIS OF THE FACIAL. 



60 1 



glosso-pharyngeal and facial nerves occurs in the tympanic cavity. The tympanic branch of 

 the glosso-pharyngeal (A) passes into this cavity, where it unites in the tympanic plexus with 

 the small superficial petrosal nerve (ft), which springs from the knee on the facial. The 

 gustatory fibres may first pass into the otic ganglion, which is always connected with the 

 chorda (Otic ganglion, p. 597, 3). Lastly, a connection is described through a twig (tt) from the 

 petrous ganglion of the glosso-pharyngeal, direct to the facial trunk within the Fallopian canal 

 (Garibaldi). 



According to some observers, the chorda contains vaso-dilator fibres for the 

 anterior two- thirds of the tongue ( Yutyian). 



Pseudo-motor Action. From one to three weeks after the section of the hypoglossal nerve, 

 stimulation of the chorda causes movements in the tongue (Philippeaux and Vulpian). These 

 movements are not so energetic as, and occur more slowly than, those caused by stimulation of 

 the hypoglossal. Nicotin first excites, then paralyses, the motor effect of the chorda. Even after 

 cessation of the circulation, stimulation of the chorda causes movements. Heidenhain supposes 



Upper branches of the Facial. 

 Trunk of the Facial. 



Mm. retrahens et attolens auricul. 



Muse, occipitalis. 



Middle branches of the Facial. 



M. stylohyoideus. 



:M. digastricus. 



Lower branches of the Facial. 



M. frontalis. 



M. corrugator supercilii. 

 M. orbicular palpebr. 



M. compressor nasi et pyram nasi 

 M. levator lab. sup. alaque nasi. 

 M. levator lab. sup. propr. 

 M. zygomatic minor. 

 M. dilatat. narium. 

 M. zygomatic, major. 



M. orbicularis oris. 



M. levator menti. 

 M. quadratus menti. 



M. triangularis menti. 



Fig. 431. 

 Motor points of the facial nerve and the facial muscles supplied by it. 



that, owing to the stimulation of the chorda, there is an increased secretion of lymph within 

 the musculature, which acts as the cause of the muscular contraction. He called this action 

 "pseudo-motor. " 



[If, after the union of the central end of the lingualis and the peripheral end of the hypo- 

 glossal nerve, the lingualis be stimulated, there is a genuine contraction of the musculature of 

 the tongue, on that side. A pseudo-motor contraction is easily distinguished from a true 

 contraction, for when a telephone is connected with the tongue, on stimulating the hypoglossal 

 the tone of the tetanus thereby produced is heard, but on stimulating the lingual, although 

 the pseudo-motor contractions occur, no sound is heard (Hogoivicz).] 



5. Connection with Vagus. Before the chorda is given off, the trunk of the facial comes 

 into direct relation with the auricular branch of the vagus (8), which crosses it in the mastoid 

 canal, and supplies it with sensory nerves (see Vagus). 



6. Peripheral Branches. After the facial issues from its canal, it supplies 



