HEAD. 97 



of the cerebral convolutions. The white substance 



forms in the hemisphere the centrum ovale of Yieussens. 



Intermaxillary space or throat.— Pharynx. — Its 



cavity presents seven openings : two for the nasal cav- 

 ities ; two for the Eustachian tubes ; one for the larynx ; 

 one for the oesophagus, and one for the isthmus of the 

 throat or of the fauces. Structure : 1 — a mucous mem- 

 brane covered bv yel low el astic fibres ; 2 — seven muscles : 

 a. palato pharyni^eus or pharyngo-staphyleus (described 

 in soft palate) 'Jj^h. Pterygo pharyngeus or superior 

 constrictor. S^^^iiyins. Pallito pharyngeus. At- 

 tachments : Pterygoid process, posterior and superior 

 face of the pharynx. Action : Perfect constrictor of 

 the pharynx 'A4c. Hyo-pharyngeus or first middle con- 

 strictorfcrZ. Thyro-pharyngeus or second middle con- 

 strictor iJe. Crico-pharyngeus or inferior constrictor. 

 Attachments ; The first to the corner of the os hyoides, 

 the second from the external surface of the thyroid 

 cartilage, the third from the cricoid cartilage, and all 



three endino; on the median fibrous line above the 



* I* 

 pharynx, are all constrictors of the pharynx jU-y. Ai'yte-^-^fcJt** 



no-pharyngeus. Attachments : The posterior border of 



the arytenoid to the origin of the oesophagus 'Jfg. Styio- 



pharyngeus. Attachments : Inside the great branch of 



the hyoid bone to the side of the pharynx. Action : 



Dilator.jro 3 — Blood vessels, the pharyngeal and thyroid 



