THE FACE 399 



auditory bulla of the skull. To it are attached the stylo-glossus and 

 stylo-pharyngeus muscles. 



The stylo-hyal is the longest and, withal, the most slender of 

 the elements. It is subcylindrical, slightly enlarged at the ends, and 

 flattened on the shaft from without inward. It is faintly bowed 

 forward, and its upper end is turned gently outward. It furnishes 

 attachment to the stylo-glossus muscles. 



FIG. 315. 



Left Tympano-hyal. 



-Left Stylo-hyal. 



;% 



Right Tympano-hyal 9 



-s3^> 



-Right Stylo-hyal. 



- Right Epi-hyal. 



Eight Cerato-hyal. 

 Sasi-hyal. 



Left Chondro-hyal. - 



Right Chondro-hyal. Right Thyro-hyal. 



HYOID BONES, VIEWED FROM BEHIND, ABOVE, AND THE 



RIGHT SIDE. 



The epi-hyal is only half as long as the stylo-hyal, but is fully as 

 wide ; it appears, therefore, to be thicker. The upper end is hardly 

 appreciably larger than the lower end. The shaft is flattened trans- 

 versely and gently bowed outward. It furnishes attachment to the 

 muscular constrictor of the pharynx. 



The cerato-hyal is less than half as long as the epi-hyal ; the 

 upper end is smaller than the lower end, which is joined to a plate 

 of cartilage which forms the union between the basi-hyal and the 

 thyro-hyal. To the cerato-hyal is attached the hyo-glossus muscle. 



The thyro-hyal is the thickest of all the hyoid bones. It is about 

 as long as the epi-hyal, but can be distinguished from it by its emargi- 

 nate upper and arcuate lower borders and its antero-posteriorly convex 

 outer and concave inner surfaces. The bone may be therefore said to 

 be bowed downward and outward. Its posterior end is'prolonged by 



