272 FACIAL ARTERY. 



it lies between the hyo-glossus and genio-hyo-glossus ; and in the 

 fourth (ranine) rests upon the lingualis to the tip of the tongue. 



Branches. 



Hyoid, 



Dorsalis lingua?, 

 Sublingual. 



The Hyoid branch runs along the upper border of the os hyoides, 

 and is distributed to the origins of the elevator muscles of the os 

 hyoides, inosculating with its fellow of the opposite side. 



The Dorsalis lingua ascends along the posterior border of the 

 hyo-glossus muscle to the dorsum of the tongue, and is distributed 

 to the tongue, the fauces and epiglottis, anastomosing with its fellow 

 of the opposite side. 



The Sublingual branch, frequently considered as a branch of 

 bifurcation of the lingual, runs along the anterior border of the hyo- 

 glossus, and is distributed to the sublingual gland and to the muscles 

 of the tongue. It is situated between the mylo-hyoideus and genio- 

 hyo-glossus, generally accompanies Wharton's duct for a part of its 

 course, and sends a branch to the fraenum linguae. It is the latter 

 branch which affords the considerable haemorrhage which some- 

 times accompanies the operation of snipping the fraenum in children. 



3. FACIAL ARTERY. The Facial artery arises a little above the 

 great cornu of the os hyoides and ascends obliquely to the submax- 

 illary gland, in which it lies embedded. It then curves around the 

 body of the lower jaw, close to the anterior inferior angle of the 

 masseter muscle, ascends to the angle of the mouth, and thence to 

 the angle of the eye, where it is named the angular artery. The 

 facial artery is very tortuous in its course over the buccinator mus- 

 cle, to accommodate itself to the movement of the jaws. 



Relations. : Below the jaw it passes beneath the digastricus and 

 stylo-hyoid muscles ; on the body of the lower jaw it is covered, by 

 the platysma myoides, and at the angle of the mouth by the depressor 

 anguli oris and zygomatic muscles. It rests upon the submaxillary 

 gland, the lower jaw, buccinator, orbicularis oris, levator anguli oris, 

 levator labii superioris proprius, and levator labii superioris alseque 

 nasi. 



Its branches are divided into those which are given off below the 

 jaw and those oh the face : they may be thus arranged : 



Below the Jaw. 



Inferior palatine, 

 Submaxillary, 

 Submental, 

 Pterygoid. 



