190 



STYLO-PHARYNGEUS. 



space, which is bounded on the inner side by the superior constrictor 

 muscle ; on the outer side by the internal pterygoid muscle ; and 

 fjehind by the rectus anticus major and vertebral column. In this 

 space are situated the internal carotid artery, the internal jugular vein, 

 and the glosso-pharyngeal, pneumogastric, spinal accessory, and hypo- 

 glossal nerve. 



Relations. By its external surface with the vertebral column and 

 its muscles, behind ; with the vessels and nerves contained in the max- 

 illo-pharyngeal space laterally, the middle constrictor, stylo-pharyngeus, 

 and tensor palati muscle. By its internal surface with the levator 

 palati, palato-pharyngeus, tonsil, and mucous membrane of the pha- 

 rynx, the pharyngeal fascia being interposed. 



p. 7 The STYLO-PHARYNGEUS 



is a long and slender muscle 

 arising from the inner side 

 of the base of the styloid 

 process ; it descends between 

 the superior and middle con- 

 strictor muscles, and spreads 

 out beneath the mucous 

 membrane of the pharynx, 

 its inferior fibres being in- 

 serted into the posterior bor- 

 der of the thyroid cartilage. 

 Relations. By its exter- 

 nal surface with the stylo- 

 glossus muscle, external ca- 

 rotid artery, parotid gland, 

 and the middle constrictor. 

 By its internal surface with 

 the internal carotid artery, 

 internal jugular vein, supe- 

 rior constrictor, palato-pha- 

 ryngeus, and mucous mem- 

 brane. Along its lower bor- 

 der is seen the glosso- 

 pharyngeal nerve which crosses it, opposite the root of the tongue, 

 to pass between the superior and middle constrictor and behind the 

 hyo-glossus. 



The palato-pharyngeus is described with the muscles of the soft pa- 



* A side view of the muscles of the pharynx. 1. The trachea. 2. The cri- 

 coid cartilage. 3. The crico- thyroid membrane. 4. The thyroid cartilage. 5. 

 The thyro-hyoidean membrane. 6 The os hyoides. 7. The stylo-hyoidean 

 ligament. 8. The oesophagus. 9- The inferior constrictor. 10. The middle 

 constrictor. 11. The superior constrictor. 12. The stylo-pharyngeus muscle 

 passing down between the superior and middle constrictor. 13. The upper 

 concave border of the superior constrictor ; at this point the muscular fibres 

 of the pharynx are deficient. 14. The pterygo-maxillary ligament. 15. The 

 buccinator muscle. 16. The orbicularis oris. 17. The mylo-hyoideus. 



