LINGUALIS. 187 



the lingualis, the genio-hyo-glossus, the lingual artery, and the glosso- 

 pharyngeal nerve. 



The LINGUALIS. The fibres of this muscle may be seen towards 

 the apex of the tongue, issuing from the interval between the hyo- 





glossus and genio-hyo-glossus ; it is best examined by removing the 

 preceding muscle. It consists of a small fasciculus of fibres, running 

 longitudinally from the base, where it is attached to the os hyoides, to 

 the apex of the tongue. It is in relation by its under surface with 

 the ranine artery. 



* The styloid muscles and the muscles of the tongue. 1. A portion of the 

 temporal bone of the left side of the skull, including the styloid and mastoid 

 processes, and the meatus auditorius externus. 2. 2. The right side of the 

 lower jaw, divided at its symphysis; the left side having been removed. 3. The 

 tongue. 4. The genio-hyoideus muscle. 5. The genio-hyo-glossus. 6. The 

 hyo-glossus muscle ; its basio-glossus portion. /. Its cerato- glossus portion. 

 8. The anterior fibres of the lingualis issuing from between the hyo-glossus and 

 genio-hyo-glossus. 9- The stylo-glossus muscle, with a small portion of the 

 stylo-maxillary ligament. 10. The stylo-hyoid. 11. The stylo-pharvngeus 

 muscle. 12. The os hyoides. 13. The thyro-hyoidean membrane. 14. The 

 thyroid cartilage. 15. The thyro-hyoideus muscle arising from the oblique line 

 on the thyroid cartilage. 1 6. The cricoid cartilage. 17. The crico-thyroidean 

 membrane, through which the operation of laryngotomy is performed. 18. The 

 trachea. 19. The commencement of the oesophagus. 



