THE ORGANS OF DIGESTION 181 



The prostatic plexus to the prostate gland, giving off the 

 cavernous nerves of the penis. 



(The vaginal plexus to the vagina. 



The uterine plexus accompanying the uterine artery to the 

 uterus.) 



THE ORGANS OF DIGESTION. 



THE TEETH. 



Temporary teeth : the following is the dental formula for 

 the temporary teeth, with the dates in months of their 

 eruption : 



Mo. Mo. Ca. In. In. In. In. Ca. Mo. Mo. 

 ( Upper ..i i i i i i i i i i = io"\ 



( Lower . . i i i i i i i i i i = ioj 

 24 12 18 9 7 7 9 18 12 24 months. 



Permanent teeth : subjoined is the dental formula for the 

 permanent teeth, with the date in years of their eruption : 



Wis. Mo. Mo. Bi. Bi. Ca. In. In. In. In. Ca. Bi. Bi. Mo. Mo. Wis. 

 I Upper ixxiiixxiiiiiiii = i61 



I Lower ixixiixxiixixii i = 16 ) 

 18 xa 6 10 9 ii 8 7 7 8 n 9 10 6 12 18 years. 



THE TONGUE. 



The tongue occupies the floor of the mouth ; its base is 

 connected with the hyoid bone, the epiglottis, the pillars of 

 the soft palate, and with the pharynx ; along its inferior 

 surface the genio-glossus runs from base to tip, connecting 

 it to the lower jaw and hyoid bone. 



The mucous membrane on the under surface is smooth, 

 forming in front a median fold, the franum lingua; on the 

 sides it is continuous with the mucous membrane of the 

 mouth. On the dorsum there is a rapht along the middle line, 

 which ends posteriorly in the foramen ccecum. Posteriorly the 

 epiglottis is connected to the tongue by three glosso-epiglottic 

 folds, the middle one being called the fr&num epiglottidis . 

 The anterior two-thirds of the dorsum of the tongue is covered 

 with papillae ; they are of three kinds : 



The circumvallate papillae (seven to ten) form a row on each 

 side at the back of the tongue, meeting in the middle line 

 thus, A, in front of the foramen caecum. 



The fungiform papilla: found principally at the apex ^nd 

 on the sides. 



