THE MUSCLES, 69 



roid cartilages. Inserted into the middle of the pharynx. Use 

 To compress part of the pharynx. 



Constrictor pharyngis medius arises from the horns and appendix 

 of the os hyoides. Inserted into the ambit of the pharynx. Use 

 To compress the pharynx, and draw the os hyoides upwards. 



Constrictor pharyngis superior arises from the pterygoid process, 

 the lower jaw, and the cuneiform process of the os occipitis. In- 

 serted into the middle of the pharynx. Use To move the pharynx 

 upwards and forwards, and to compress its upper part. 



MUSCLES SITUATED ABOUT THE GLOTTIS. 



Crico-arytanoideus posticus arises from the cricoid cartilage pos- 

 teriorly. Inserted into the back of the arytsenoid cartilage. Use 

 To open the glottis. 



Crico-arytanoideus later alis arises from the side of the cricoid 

 cartilage. Inserted into the side of the arytsenoid cartilage. Use 

 To open the glottis. 



Thyreo-aryt&noideus arises from the back of the thyroid cartilage. 

 Inserted into the fore part of the arytsenoid cartilage. Use To 

 draw the arytasnoid cartilage forward. 



Aryt&noideus obliquus arises from the root of one arytaBnoid -car- 

 tilage. Inserted into the extremity of the other. Use To draw 

 them towards each other. 



Arytanoideus transversus arises from one of the arytsenoid car- 

 tilages. Inserted into the other arytsenoid cartilage. Use To 

 shut the glottis. 



Tyreo-epiglottideus arises from the thyroid cartilage. Inserted 

 into the side of the epiglottis. Use To pull the epiglottis obliquely 

 downwards. 



Aryt&no-epiglottideus arises from the upper part of the arytsenoid 

 cartilage laterally. Inserted into the side of the epiglottis. Use 

 To move the epiglottis outwards. 



MUSCLES SITUATED ON THE ANTERIOR PART OF THE ABDOMEN. 



Obliquus descendens externus arises from the lower edges of the 

 eight inferior ribs near the cartilages. Inserted into the linea alba, 

 ossa pubis, and spine of the ilium. Use To compress the abdomen. 



Obliquus ascendens internus arises from the spinous processes of 

 the three last lumbar vertebrae, back of the sacrum, and spine of the 

 ilium. Inserted into the cartilages of all the false ribs, linea alba, 

 pubis, and sternum, by a flat tendon. Use To compress the ab- 

 domen. 



