466 



THE MUSCULAR SYSTEM. 



of the muscles of opposite sides decussate in the median plane, in the inferior part 

 of the pharyngeal wall. 



Nerve-Supply. The muscle is innervated through the pharyngeal plexus, by the accessory 



nerve. 



The Muscles of the Soft Palate. 



The soft palate and uvula form a muscular fold, covered on each surface by 

 mucous membrane, projecting backwards into the pharynx, and forming the posterior 



parts of the floor of the nasal 

 cavities and the roof of the mouth. 

 The muscular fold is composed 

 of five pairs of muscles the 

 pharyngopalatinus, m. uvulse, 

 levator veli palatini, tensor veli 

 palatini, and glossopalatinus. 



The pharyngopalatinus 

 muscle has been already described 

 (p. 465). 



The m. uvulae 



BUCCINATOR- 



MYLO-HYOID 



HYOGLOSSUS 



DIGASTRIC 



STYLO-HYOID 



OMO-HYOID 

 STERNO-HYOID 



THYREO-HYOID 



CRICO-THYREOID 



TENSOR VELI PALATINI 



MUSCLE 



Auditory tube 



LEVATOR VELI PALATINI Q f 



Pterygo-mandibular 



raphe 



SUPERIOR CONSTRICTOR 



STYLOPHARYNGEUS 



YLOGLOSSUS 

 Glosso-pharyngeal 

 nerve 

 Stylo-hyoid ligament 



Hypo-glossal nerve 



(0. T. 



azygos 



consists 

 two narrow 

 bundles enclosed, 

 along with the 

 insertion of the 

 levator veli pala- 

 tini, between the 

 layers of the 

 pharyngopala- 

 tinus. The slips 

 arise from the 



External laryngeal 

 nerve 



FIG. 413. LATERAL VIEW OF THE WALL OF THE PHARYNX. 



MIDDLE CONSTRICTOR 



DIGASTRIC 



Superior laryngeal 



nerve 



INFERIOR CONSTRICTOR posterior 



spine and the 

 aponeurosis of the 

 soft palate, and 

 unite as they pro- 

 ceed backwards to 

 end in the uvula. 

 M. Levator 

 Veli Palatini. 

 The levator veli 

 palatini has a 

 double origin : (1) 

 from the inferior 

 surface of the apex 

 of the petrous por- 

 tion of the tern- 



(Esophagus 

 Recurrent nerve 



poral bone, and (2) from the inferior part of the cartilaginous part of the 

 auditory tube. It passes obliquely downwards and medially, across the superior 

 border of the superior constrictor muscle, and enters the soft palate between the 

 two layers of the pharyngopalatinus muscle. 



It is inserted into the aponeurosis of the soft palate, and some of its fibres 

 become continuous with those of the opposite muscle. 



It is separated from the tensor veli palatini muscle by the auditory tub( 

 and the deeper layer of the pharyngopalatinus muscle. 



M. Tensor Veli Palatini. The tensor veli palatini arises (1) from th< 

 scaphoid fossa and the angular spine of the sphenoid bone, and (2) from the latera 

 side of the cartilaginous part of the auditory tube. 



