THE HEAD AND NECK. 79 



median nerve fuses with the outer head from the outer cord ; internal cutaneous 

 nerve, to inner forearm ; lesser internal cutaneous, to inner arm ; ulnar nerve, 

 to forearm and hand. 



Posterior cord : Three subscapular nerves to posterior wall of axilla ; 

 musculo-spiral to the muscles of the posterior part of arm and forearm ; circum- 

 flex to the deltoid and teres minor. 



THE MOUTH. 



The structures seen in the mouth of a patient are : 



1. The tongue-tip, dorsum, and sides. 



2. The dental arches and the teeth. 



3. The vestibule the space outside the dental arches. 



4. The frsenum linguae. 



5. The uvula in mid-line of the soft palate. 



6. Tonsil in the tonsillar recess. (Fig. 47.) 



7. The palato-glossal fold of mucous membrane. (Fig. 47.) 



8. The palato-pharyngeal fold of mucous membrane. (Fig. 47.) 



9. The posterior pharyngeal wall. 



10. The orifice of Stenson's duct, opposite second upper molar. 



1 1. The general oral mucous membrane. 



12. The soft palate and its subdivisions. 



The fold of mucous membrane, the palato-glossal fold, is supported by a 

 muscle the palato-glossal muscle. Also a muscle, the palato-pharyngeal, is 

 under the palato-pharyngeal fold of mucous membrane. These two muscles 

 form the anterior and posterior boundaries of the tonsillar recess, in which is 

 found the tonsil. Having made yourself familiar with the physical appearances 

 of the above structures on the living, find on the cadaver the following : 



1. The genio-hyoid muscle. (Fig. 47.) 



2. The genio-hyo-glossus muscle. (Fig. 47.) 



3. The stylo-hyoid muscle. (Fig. 35.) 



4. The stylo-glossus muscle. 



5. The stylo-pharyngeus muscle. 



6. The Eustachtan orifices and pharyngeal tonsil. 



7. The lingualis muscle. (Fig. 46.) 



8. The tonsil in its recess ; between what two muscles ? 



9. The palato-pharyngeal fold and muscle. 



10. The palato-glossal fold and muscle. 



1 1. The hypoglossal nerve (twelfth cranial). (Fig. 31.) 



1 2. The gustatory nerve (lingual of fifth cranial nerve). 



13. The glossal branch of glosso-pharyngeal nerve. (Fig. 34.) 



14. The chorda tympani of the seventh cranial nerve. 



15. The lingual artery and vein. (Figs. 31 and 47.) 



16. The salivary apparatus and blood-supply. (Fig. 45.) 



17. The mylo-hyoid muscle the floor of the mouth. (Fig. 35.) 



1 8. The isthmus of the fauces. 



19. The anterior pillar = palato-glossus muscle. (Fig. 47.) 



20. The posterior pillar == palato-pharyngeus muscle. (Fig. 47.) 



21. The azygos uvula,' muscle. 



22. The levator palati muscle. 



23. The circumflexus palati (tensor palati). 



How to Dissect the Tongue. The dissection of the neck, you will recall by 



