40 



TOPOGRAPHICAL ANATOMY OF THE 



and jugulo-mandibular muscles. Branches are furnished to the parotid 

 gland, and the pterygoid and jugulo-mandibular muscles. 



The masseteric vein follows the inferior border of the artery. 



Dissection. — KeHect the nasolabial and zygomatic muscles. 



M. LEVATOR LA15II SUPERIORIS PROPRius. — The proper levator of 

 the upper lip is largely covered by the naso-labial muscle. It has an 

 elongated triangular outline, the base of the triangle being formed 



N. buccalis dorsalis. 



A. angularis oculi. 



M. levator labii superioris proprius. 

 A. dorsalis nasi. 



A. lateralis nasi. 

 / N. infraorbitalis. 



dilator naris superior. 

 M. nasolabiahs. 



Di\ erticulum nasi. 



M. dilator nans superior. 



M. caninus. 



M. masseter. < j j | 



N. buccalis ventralis. ■ I i 



V. facialis. | ' 



A. labialis inferior. I 



A. facialis, j 

 Parotid duct. 

 M. buccinator 



M. risorius. 

 M. zygomaticus. 



M. orbicularis oris. 



M. depressor labii inferioris. 

 Fig. 13. — The cheek, lips and nose. - 



by the flattened origin from the bones of the face in the region 

 of the union of the lachrymal, zygomatic and maxilla. A rounded 

 tendon leaves the narrow end of the muscle and crosses the lateral 

 face of the nose obliquely to reach the end of the nasal bone. 

 Here the tendons of the muscles of the two sides of the head unite to 

 form a broad, thin tendinous band that passes to the upper lip in the 

 substance of which its fibres radiate. 



M. TRANSVERSUS NASI. — The transverse nasal muscle is unpaired and 

 consists of fibres that form a broad but short band, passing from one 

 alar cartilage to the other. The posterior border of the muscle is 



