CEPHALIC NERVES. GLOSSO-PHARYNGEAL NERVE. 687 



tion, but conveying impressions to the Medulla Oblongata, which produce reflex 

 movements of the motor nerves concerned in deglutition ( 427). This view 

 of its function was deduced by Dr. J. Reid from minute anatomical investiga- 

 tion, and from a large number of experiments. Some experimenters assert that 



Fig. 185. 



The distribution of the Facial nerve, and the branches of the Cervical plexus. 1. The facial nerve, escaping 

 from the stylo-mastoid foramen, and crossing the ramus of the lower jaw; the parotid gland has been removed 

 in order to see the nerve more distinctly. 2. The posterior auricular branch; the digastric and stylo-mastoid 

 filaments are seen near the origin of this branch. 3. Temporal branches, communicating with (4) the branches 

 of the frontal nerve. 5. Facial branches, communicating with (6) the infra-orbital nerve. 7. Facial branches, 

 communicating with (8) the mental nerve. 9. Cervico-facial branches, communicating with (10) the super- 

 ficialis colli nerve, and forming a plexus (11) over the submaxillary gland. The distribution of the branches 

 of the facial in a radiated direction over the side of the face constitutes the pes anserinus. 12. The auricularis 

 mognus nerve, one of the ascending branches of the cervical plexus. 13. The occipitalis minor, ascending along 

 the posterior border of the sterno-mastoid muscle. 14. The superficial and deep descending branches of the 

 cervical plexus. 15 . The spinal accessory nerve, giving off a branch to the external surface of the trapezius 

 muscle. 16. The occipitalis major nerve, the posterior branch of the second cervical nerve. 



they have succeeded in exciting direct muscular actions through its trunk ; but 

 these actions seem to be limited to the stylo-pharyngei and to the palato-glossi 

 muscles. Much controversy has taken place on the question whether this nerve 

 is to be regarded as ministering, partly or exclusively, to the sense of Taste ; 

 and many high authorities have ranged themselves on each side. The question 

 involves that of the function of the Lingual branch of the 5th pair ; and it is 

 partly to be decided by the anatomical relations of the two nerves respectively. 

 The Glosso-pharyngeal is principally distributed on the mucous surface of the 

 fauces, and on the back of the tongue ; but, according to Valentin, it sends a 

 branch forwards, on either side, somewhat beneath the lateral margin, which 

 supplies the edges and inferior surface of the tip of the tongue, and inosculates 

 with the Lingual branch of the 5th. On the other hand, the upper surface of 

 the front of the tongue is supplied by this Lingual branch. The experiments 

 of Dr. Alcock, whose conclusions are borne out by Dr. J. Reid, decidedly sup- 

 port the conclusion that the gustative sensibility of this part of the tongue is 

 chiefly due to the latter nerve, being evidently impaired by division of it. On 

 the other hand, it is equally certain that the sense of taste is not destroyed by 



