Chap. VIII] SPECIAL MEMBRANES AND GLANDS 131 



From the upper and back 

 part of the pharynx a pro- 

 longation extends on each 

 side, along the passage 

 to the ear, — Eustachian 

 tube,^ — and offsets in the 

 ahmentary canal go to Hne 

 the saHvary, pancreatic, 

 and biHary ducts, and the 

 gall-bladder. 



(2) Genito-urinary. — 

 The genito-urinary mucous 

 membrane line^ the inside 

 of the bladder, and the 

 whole urinary tract from 

 the interior of the kidneys 

 to the meatus urinarius, or 

 orifice of the urethra ; it 

 also lines the vagina, 

 uterus, and Fallopian 

 (uterine) tubes in the fe- 

 males. A study of Figs. 

 91 and 92 will make this 

 plain. 



Structure. — A mucous 

 membrane is composed of 

 a layer of connective tissue 

 called the corium, which 

 is bounded toward the free 

 surface by a basement 

 membrane and covered by 

 a layer of epithelium. Be- 

 neath the corium we usu- 

 ally find a thin layer of 

 muscular tissue called the 

 muscularis mucosae. From 

 the above, it will be seen 



1 Named after Eustaehius, a 

 famous anatomist. 



FRONTAL 

 SINUSES 

 0UCT8 OF 

 LACHRYMAL GLANnS 

 UPPER LIDS 

 EY[ 

 LOWER LIDS 



TEAR DUCTS 



.ETHMOIDAL SINUSES 



.SPHENOIDAL 

 SINUSES 



,MAXILLAR¥ 



SINUSES 



^MIDDLE EARS 

 I MASTOID 

 CAVITIES 

 EUSTACHIAN TUBEJ 



Fig. 90. — Dia- 

 gram OF THE GaSTRO- 

 PULMONARY MuCOUS 



Membrane, show- 

 ing THE Continuity 

 OF ALL ITS Parts. 

 (Gerrish.) 



