rilK HKAD AND xNECK 



29.' 



(b) The corrugator supercilii, a conspicuous band closely associ- 

 ated at its ins(;rli(jn with the foregoing and probably 

 operating in conjunction with the orbicularis oculi in firmly 

 closing the eye. Origin: Anterodorsal margin of the 

 zygomatic arch. Insertion: In front of and dorsal to the 

 upper eyelid. 



git 



Fio. 107. Lateral view of the head. The insf;rtion portions of the quadratus 

 labii superioris and the zygomaticus minor, the origin of the caninus, and the 

 anterior part of the zygomatic arch with the attached portion of the mas.seter 

 have been removed, as have the more superficial structures. The buccinator 

 muscle has been divided along two longitudinal lines to reveal the underlying 

 buccal glands. 



b, buccinator muscle; bi, inferior buccal gland; bs, superior buccal gland; 

 c, caninus, remnant of insertion portion; sc, corrugator supercilii, in.scrtion 

 portion; dp, parotid duct; fl, facial lymph gland; gi, infraorbital gland; gl, 

 lymph glands; git. temporal lobe of lacrimal gland; gm, masseteric gland; gms. 

 superficial mandibular gland; gp, parotid gland; Ian,' levator alae nasi; m, cut 

 end of zygomatic process of maxilla; mi, sc^Jarable posterior jjart of internal 

 division of masseter muscle; mt, temporal muscle, origin portion; nf, facial 

 nerve; nio, infraorbital nerve; qli, quadratus labii inferioris; qls, quadratus 

 labii superioris; z, zygomatic gland; zm, zygomaticus minor, origin. 



(c) The quadratus labii superioris. Origin: The postero- 

 lateral corner of the nasal bone, the frontal process of the 

 premaxilla, and the maxillary process of the frontal bone. 

 Insertion : Skin of the upper lip.^ 



(d) The zygomaticus minor.. Origin: Anterior surface of the 

 zygomatic process of the maxilla. Insertion: Skin of the 



^The levator alae nasi and zygomaticus minor muscles may he considerefl to 

 be subdivisions of this muscle. 



