414 SPLANCHNOLOGY, OR ANATOMY OF THE VISCERA 



The eruption of the temporary teeth commences at the 

 end of the seventh month, and is completed about the end 

 of the second year. 



The period of eruption of the temporary teeth are (C. S. 

 Tome) : 



Lower central incisors .... 6 to 9 months. 



Upper incisors 8 to 10 months. 



Lower lateral incisors and first molars 15 to 21 months. 



Canines 16 to 20 months. 



Second molars 20 to 24 months. 



The period of eruption of the permanent teeth are: 



First molars 6| years. 



Two middle incisors .... 7th year. 



Two lateral incisors .... 8th year. 



First bicuspid 9th year. 



Second bicuspid 10th year. 



Canine llth to 12th year. 



Second molars 12th to 13th year. 



Third molars 17th to 21st year. 



THE TONGUE (LINGUA) 



The tongue is the organ of the special sense of taste, also 

 assisting in insalivation, mastication, and deglutition. It 

 is situated in the floor of the mouth, in the interval between 

 the horizontal rami of the mandibfe. It is attached to the 

 hyoid bone at the base by the genioglossus and hyoglossus 

 muscles and the hyoglossal membrane; with the epiglottis 

 by three folds, the glossoepiglottic folds, of mucous membrane; 

 with the soft palate by means of the anterior pillars of the 

 fauces; and with the pharynx by the superior constrictor 

 muscles and the mucous membrane. 



The muscles controlling the tongue are the extrinsic, which 

 are inserted into the tongue, their terminal fibers contained 

 within the substance, namely: The styloglossus, the hyo- 

 glossus, the palatoglossus, the genioglossus, and part of the 

 superior constrictor of the pharynx (pharyngoglossus). The 

 intrinsic muscles of the tongue are: The superior lingualis, 



