300 SPECIAL ANATOMY. 



of the os kyoides. Course : obliquely upwards, then along the superior 

 border of the hyoid bone, forwards and inwards, and thence into muscles of 

 the tongue from behind forwards. Termination : at the tip of the tongue as 

 Art. ranina. Position : commences below m. digastricus, stylo-hyoid, and 

 n. hypoglossus ; on the os hyoides between m. hyogloss. and constrictor pha- 

 ryng. medius; in the tongue between m. genioglossus and lingualis (close to 

 n. lingualis.) 



Branches : 



a. Ram. hyoideus, passes away transversely above the hyoid bone, anas- 

 tomoses with that of the other side, between m. genio-glossus and genio- 

 hyoideus. 



b. Art. dorsalis lingua, small, arises on a plane with the cornu majus oss. 

 hyoid, passes upwards to the border of the tongue and to arcus glosso- 

 palatinus, forwards and inwards, always close under the mucous mem- 

 brane, gives branches to the epiglottis, mm. hyo-, andstylo-glossus; lastly, 

 the skin in the region of papilla calyciformes . 



c. Art. sublingualis, stronger than the former, passes between m. mylo- 

 hyoideus and the mucous membrane, upon the floor of the mouth forwards, 

 along the inferior border of glandul. sublingual., external to the duct. 

 Whartonianus , supplies these parts, and terminates with a branch above 

 ihefrenulum and a branch for the foramina incisiva at the chin. 



d. Art. ranina s. prof undo,, the terminal branch, penetrates above into the 

 thickness of the tongue, between m. geniogloss. and lingualis (half an 

 inch distant from the back of the tongue), and runs along to the tip, as 

 it gives off internal, external, and superior branches for the muscles and 

 papilla?. 



3. Maxillaris externa, s. facialis. large. Or. : rather higher than lin- 

 gualis, covered by TO. digastric, and stylohyoideus. Course : very serpentine ; 

 at first upwards to the angle of the lower jaw, then horizontally forwards in 

 the fossa on the outer surface of gland, submaxillaris; towards the middle of 

 the horizontal ramus of the lower jaw it turns over it into the face, passes ob- 

 liquely upwards to the mouth, nose, and internal angle of the eye, and anas- 

 tomoses with Artt. ophthalmica and infraorbitalis . Position: at first be- 

 tween gland, submaxill. andparotis, along the basis of the lower jaw: exter- 

 nally the skin and lymphatic glands, internally the gland, submaxillaris; in 

 the face on the anterior border of m. masseter, below covered by the skin 

 (with m. risorius), above the angle of the mouth by the zygomatici and leva- 

 tores labii, lastly, by much fat and skin. 



544. Branches of the horizontal portion. 



a. Art. Palatina ascendens (arises sometimes from Corot. externa or pha- 

 ryngea ascendens), ascends behind mm. styloidei, to the side of the pharynx, 

 ramifies in the Tonsils (Art. tonsillaris), the soft palate and its arches, anas- 

 tomoses with A. pharyngea ascendens. 



