82 



THE EUSTACHIAN TUBE, BY PROFESSOR RUDINGER. 



the pharynx and oesophagus ; the several acini become aggre- 

 gated into larger masses, the moderately wide excretory tubes 

 of which open into the tuba at various points. The epithe- 

 lium of the ducts presents the characters of a transitional form 

 between tha't of the mucous membrane and that of the gland 



Fig. 29f . 



Fig. 295. The cartilage represented in connection with the mucous 

 membrane of the safety tube. 1, Ciliated epithelium ; 2, sub- 

 mucosa ; 3, dense fibrous layer ; 4, perichondrium ; 5, cartilage cells 

 with small elongated nuclei ; 6, groups of fibres with cartilage cells. 

 Magnified 170 diameters. 



vesicles. The several spheroidal or elongated acini are filled by 

 cuneiform epithelial cells, which leave only a small cavity in 

 the centre. 



The acinous mucous glands exhibit great variations in their 



