36 



ON THE FORM AND SIZE 



More frequently dee/p 'pockets, or fossce, are 

 formed in various parts of tlie cavity, particu- 

 larly at the anterior or posterior corners of the 

 floor (Fig. 11), and along the upper part of the 



Fig. 11. 



Antrum with pockets in the anterior and posterior corners of the floor, perforated by 

 alveolar abscess, in the possession of Mr. Tomes {transverse section). 



anterior wall immediately beneath the orbital 

 plate (Fig. 10). Sometimes a bony canal ter- 

 minates in a cul-de-sac beneath the orbital plate 

 in the nasal corner of the anterior wall (Fig. 12). 

 An intimate knowledge of irregular formations of 

 the antrum will contribute to the diagnosis and 

 treatment of those maladies which are usually 



