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glands, which in part separate it from the bnccal mucous mombrano. The 

 external, covered by tho skin, adheres to it in tin- most intimate manner, ;unl 

 is found isolated from it only on the median line, at first by tho apoueurotic 

 expansion of tho supermaxillo-labialis, then by a muKculo-tibrous layer 

 analogous to that which forms the meuto-labiulis. 



By its internal face, tho inferior fasciculus likewise responds to tho buccal 

 mucous membrane, and to some salivary glands. By its external face, it 



Fig. 110. 



SUPERFICIAL MUSCLES OF THE FACE AND HEAD. 



1, Temporo-anricularis externus, or attolleus maximus ; 2, Levator palpebrae, or 

 corrugator supercilii ; 3, Temporo-auricularis interims, or attollens posterior ; 

 4, 5, Zygomatico-auricularis, or attollens anterior ; 6, Orbicularis palpebrarum ; 

 7, Parotido-auricularis, or deprimens aurem ; 8, Parotid gland ; 9, Temporal, or 

 subzygomatic vein; 10, Ditto, artery; 11, 12, Superior and inferior maxillary 

 nerves; 13, Fascia of the masseter muscle; 14, Nasal bones; 15, Supernaso- 

 labialis, or levator labii superioris ala-que nasi ; 16, Supermaxillo-labialis, or 

 nasalis longus labii superioris ; 17, External maxillary or facial artery ; 18, 

 Facial vein ; 19, Supermaxillo-nasalis magnus, or dilatator naris lateralis ; 20, 

 Superior maxillary nerve; 21, Zygomatico-labialis, or zygomaticus; 22, Parotid, 

 or Stenon's duct ; 23, Masseter ; 24, Alveolo-labialis, or buccinator ; 25, Super- 

 maxillo-nasalis parvus, or nasalis brevis labii superioris; 27, Labialis, or orbicti- 

 laris oris ; 28, Maxillo-labialis, or depressor labii inferioris; 29, Mento-labialis, 

 or levator menti. 



forms an intimate union with the cutaneous integument, like the superior 

 fasciculus. 



This muscle plays the part of a constrictor of the anterior opening of the 

 mouth, and has complex functions to perform in suction, the prehension of 

 food, and in mastication. 





2. Alveolo-labialis. (Fig. 110, 24.) 





Synonyms. Molaris externuset interims Bourgelat. (Buccinator Pjrcitatt. Leyh 

 divides this muscle into two portions ; its superficial plane he designates the buccinator, 

 ;ni<l the deep plane the molaris.) 



Preparation. Proceed to the ablation of the masseter ; dissect the external surface of 

 the muscle, taking care of the risorius Santorini and xygomuticus, which ore confouinlrd 

 with it. Then divide it in tin- middle, as far as the commissure of the lips; turn 

 down each strip (in the jaws, and remove the mucous membrane, in order to study the 

 inner face of the muscle and the attachments of the superficial plane to the maxillary 

 bones. 





