584 TEE ARTEEIES. 



interstice between the genio-glossus and basio-glossus muscles, where 

 it meets the branches of the lingual and hypoglossal nerves. 



Flexuous in its course, in order to adapt itself to the elongation of the 

 tongue, the lingual artery emits a very great number of collateral branches, 

 which escape perpendicularly from the entire periphery of the vessel; 

 but chiefly above, below, and on the inner side, to ramify in the muscles 

 and integuments of the tongue. 



Eunning parallel to each other, the two lingual communicate by 

 five transverse ramuscules, and join at their terminal extremity, which 

 becomes very slender. 



3. SUBLINGUAL ARTERY (Fig. 286, 16). This artery has its origin 

 at the anterior extremity of the maxillary gland, and runs forward along the 

 external surface of the mylo-hyoideus muscle, which it afterwards crosses 

 towards the posterior extremity of the sublingual gland. It then follows 

 the inferior border of this gland, sending into it numerous branches, 

 and after giving some filaments to the genio-glossus and genio-hyoideus 

 muscles, is prolonged on the sides of the fraenum linguse, where it ends by 

 fine ramuscules in the buccal mucous membrane. 



Among the branches this artery detaches before attaining the sublingual 

 gland, it is necessary to distinguish those which are destined to the myl /- 

 hyoideus muscle, some of which, the descending, are thin and irregular ; 

 and others, ascending, being long, thick, and parallel to each other. 



Sometimes this artery does not reach the sublingual gland; it then 

 remains, for the whole of its extent, external to the mylo-hyoideus muscle, 

 and sends its terminal divisions to the vicinity of the symphysis of tl e 

 chin. In this case, the gland receives a special branch from the lingual 

 artery, a circumstance which is usual in Man, in whom this artery is named 

 the submental. 



4. CORONARY OR INFERIOR LABIAL (Fig. 286, 17). S| ringing from the 

 glosso-facial artery at an acute angle, shortly before that vessel arrives 

 at the maxillo-labial muscle, the inferior coronary artery passes under that 

 muscle, and following its direction, descends into the texture of the lower 

 lip, where it is mixed up with the ramifications of the mental nerve, 

 and where it terminates by forming a very fine anastomotic arch with 

 the vessel of the opposite side. 



In its track, it gives branches to the buccinator and maxillo-labial 

 muscles, and to the tissues of the lower lip, to which it is chiefly destined. 

 In its passage near the mental foramen, it receives the inferior denial artery 

 as it leaves that opening. 



5. CORONARY OR SUPERIOR LABIAL ARTERY (Fig. 286, 18). Smaller 

 than the preceding vessel, and often altogether rudimentary, this artery 

 is detached from the principal trunk at nearly a right angle, above the 



11, Terminal extremity of the vertebral artery joining the atloido-muscular 

 branch; 12, External carotid artery; 13, External maxillary artery ; 14, Pha- 

 ryngeal artery; 15, Lingual artery; 16, Sublingual artery; 17, Coronary, or 

 infei-ior labial artery; 18, Coronary, or superior labial artery, 19, Superior 

 terminal branch of the external maxillary artery ; 20, Inferior terminal branch 

 of ditto; 21, Maxillo-muscular artery; 22, 23, Posterior auricular artery; 24, 

 Superficial temporal trunk ; 25, Subzygomatic artery ; 26, Inferior auricular 

 artery ; 27, Internal maxillary artery ; 28, Inferior dental artery ; 29, Fasciculi 

 of pterygoid arteries ; 30, Tympanic artery ; 31, Spheno-spinous artery , 32, Deep 

 posterior temporal artery ; 33, Deep anterior temporal artery ; 34, Ophthalmic 

 artery; 35, Supra-orbital artery; 36, Lachrymal artery; 37, Buccal-artery ; 38, 

 Palatine artery i 39, Superior dental artery ; 40, Orbital branch of that vessel 



