THE FACIAL NERVE 



81 



condition, certain sounds become greatly exaggerated and 

 the patient may even complain that they cause definite pain. 

 The stapedius is not paralysed in supra-nuclear lesions of 

 the facial, and it is, therefore, believed that it possesses 

 bilateral representation in the cerebral cortex. 



The course of the chorda tympani is described on page 84. 



It is sometimes desirable to apply a counter-irritant over 



FIG. 43. Schematic representation of the Branches of the Facial Nerve. 



i Facial nerve. 



2. Nervus intermedius (of Wrisberg). 



3. Acoustic nerve. 



4. Greater superficial petrosal nerve. 



5. Geniculate ganglion. 



6. Nerve to stapedius. 



7. Stylo-mastoid foramen. 



8. Posterior auricular nerve. 



9. Nerve to stylo-hyoid and posterior 



belly of digastric. 

 10 Chorda tympani. 

 i r. Lingual nerve 

 12. Terminal branches of facial 



nerve. 



the facial nerve at the point where it emerges from the stylo- 

 mastoid foramen. This point corresponds on the surface to 

 the upper part of the depression between the mastoid process 

 and the external ear. 



After leaving the skull^ the facial nerve gives off certain 



muscular branches, before it enters the parotid gland. These 



branches are distributed to the occipitalis> the posterior and 



superior auricular muscles^ and ti\t posterior belly of the digastric 



6 



